The field guide to clear thinking
Mental models and cognitive biases, explained
88 ways to think better and 72 ways the mind fools you. Each one in a sentence, then how it works, real examples and where it fails.
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- The Overton windowThe Overton window is the range of ideas the public currently finds acceptable to discuss and enact.
- Schelling pointA Schelling point is the choice people converge on when they must coordinate without communicating — the option that feels natural, obvious, or salient to everyone.
- Marginal thinkingMarginal thinking is making decisions based on the next additional unit — the extra cost and extra benefit of one more — rather than on totals or averages.
- Illusion of transparencyThe illusion of transparency is the tendency to overestimate how well others can perceive your inner states — your nervousness, feelings, or thoughts.
- The mere-exposure effectThe mere-exposure effect is the tendency to like things simply because they’re familiar.
- Illusory superiorityIllusory superiority is the tendency to overestimate your qualities relative to others — to rate yourself above average on skill, ethics, and judgement.
- Zero-sum vs positive-sumA zero-sum game is one where one person’s gain is another’s exact loss — the pie is fixed.
- Hot-hand fallacyThe hot-hand fallacy is the belief that someone who has succeeded several times in a row is "on a streak" and more likely to succeed again — even when each attempt is statistically…
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Mental models A–Z (88)
Tools for deciding, predicting and seeing a situation clearly.
No mental models match.
- Activation energyActivation energy is the initial push required to start a reaction or change — the upfront cost of getting going, even when the change is beneficial once underway.
- AnchoringAnchoring is the way an initial number — even an arbitrary or irrelevant one — pulls our later estimates toward it.
- AntifragilityAntifragility is the property of things that gain from disorder — they grow stronger under stress, volatility, and shocks rather than merely resisting them.
- Barbell strategyThe barbell strategy is combining two extremes while avoiding the middle: pairing a very safe core with a small allocation of high-risk, high-upside bets.
- Base-rate neglectBase-rate neglect is the habit of judging a specific case on its vivid details while ignoring how common the category is to begin with.
- Bayesian thinkingBayesian thinking is updating your beliefs in proportion to new evidence — starting from a prior probability and revising it as data arrives, rather than holding fixed opinions.
- BottleneckA bottleneck is the single constraint that limits the output of an entire system — the narrowest point through which everything must pass.
- Chesterton's fenceChesterton's fence is the principle that you should not remove or change something until you understand why it was put there in the first place.
- Circle of competenceYour circle of competence is the set of areas where you genuinely have expertise.
- Cognitive dissonanceCognitive dissonance is the mental discomfort of holding two beliefs — or a belief and an action — that clash.
- Comparative advantageComparative advantage is the principle that you should specialise in what you give up the least to produce, then trade — even if someone else is better at everything.
- CompoundingCompounding is growth that feeds on itself: returns generate further returns, so gains accelerate over time rather than adding up linearly.
- Confirmation biasConfirmation bias is the tendency to seek, notice, and remember evidence that fits what we already believe, while overlooking or explaining away what doesn’t.
- Conway’s lawConway’s law states that any organisation that designs a system will produce a design whose structure mirrors the organisation’s own communication structure.
- Creative destructionCreative destruction is the process by which new innovations replace and dismantle the old — Joseph Schumpeter’s term for how capitalism continually revolutionises itself from within,…
- Critical massCritical mass is the threshold at which a system becomes self-sustaining — the point where enough has accumulated for a process to keep going on its own.
- Diminishing returnsDiminishing returns is the principle that as you add more of one input, the extra output it produces eventually shrinks.
- Dunbar's numberDunbar's number is the theory that humans can maintain only about 150 stable social relationships — the cognitive limit on the number of people with whom you can sustain meaningful,…
- Economic moatAn economic moat is a durable competitive advantage that protects a business from rivals, the way a moat protects a castle.
- Economies of scaleEconomies of scale are the cost advantages a business gains as it grows: producing more spreads fixed costs over more units, so the cost per unit falls.
- EmergenceEmergence is when a system exhibits properties or behaviours that its individual parts do not have on their own.
- EntropyEntropy is a measure of disorder, and physics says it always increases in a closed system.
- ErgodicityErgodicity is whether the average outcome across many people (the ensemble average) equals the average for one person over time (the time average).
- Expected valueExpected value is the average outcome of a decision if you could repeat it many times — each possible result weighted by its probability.
- First-principles thinkingFirst-principles thinking is breaking a problem down to its most basic, undeniable truths and reasoning up from there — rather than reasoning by analogy to how things are usually done.
- FlywheelA flywheel is a self-reinforcing loop where each part feeds the next, so momentum builds over time.
- Gall’s lawGall’s law holds that a complex system that works is invariably found to have evolved from a simple system that worked.
- Game theoryGame theory is the study of strategic decisions, where your best move depends on what others choose and theirs depends on you.
- Goodhart's lawGoodhart's law states that when a measure becomes a target, it ceases to be a good measure.
- Hanlon’s razorHanlon’s razor says: never attribute to malice that which is adequately explained by stupidity, carelessness, or circumstance.
- Hyperbolic discountingHyperbolic discounting is our tendency to over-value rewards that arrive sooner and steeply discount ones that arrive later — and to do so inconsistently, caring far more about a delay…
- IncentivesIncentives are the rewards and punishments that drive behaviour.
- InversionInversion is solving a problem from the opposite end — asking how to fail, then avoiding that.
- Jevons paradoxJevons paradox is the counter-intuitive finding that making the use of a resource more efficient often increases total consumption of it — because greater efficiency lowers the effective…
- LeverageLeverage is using a small input to produce a disproportionately large output — Archimedes’ "give me a lever long enough and I will move the world." As a mental model, it asks where a…
- Local vs global optimumA local optimum is the best option within your immediate vicinity; a global optimum is the best option overall.
- Loss aversionLoss aversion is the finding that losing something hurts about twice as much as gaining the same thing feels good.
- Margin of safetyMargin of safety is building a buffer between what you expect and what you can withstand — so that errors, bad luck, or wrong assumptions don’t cause catastrophe.
- Marginal thinkingMarginal thinking is making decisions based on the next additional unit — the extra cost and extra benefit of one more — rather than on totals or averages.
- Metcalfe's lawMetcalfe's law states that the value of a network grows roughly with the square of the number of its users (n²), because each new user can connect with all the others.
- Moore's lawMoore's law is the observation that the number of transistors on a chip roughly doubles every two years, so computing power grows exponentially while cost falls.
- Mr. MarketMr. Market is Benjamin Graham’s parable for the stock market personified as a moody business partner who offers to buy or sell every day at wildly swinging prices.
- Nash equilibriumA Nash equilibrium is a state in a game where no player can do better by changing their strategy alone, given what everyone else is doing.
- Natural selectionNatural selection is the process by which traits that aid survival and reproduction become more common over generations.
- Network effectsA network effect is when a product or service becomes more valuable as more people use it.
- Occam’s razorOccam’s razor is the principle that, among competing explanations, the one requiring the fewest assumptions is usually the best place to start.
- Opportunity costOpportunity cost is the value of the best alternative you give up when you make a choice.
- OptionalityOptionality is having choices with limited downside and large potential upside — keeping options open so you can benefit from good outcomes while capping your losses on bad ones.
- Parkinson's lawParkinson's law is the observation that work expands to fill the time available for its completion.
- Path dependencePath dependence is when the outcomes available today are constrained by the sequence of decisions and events that came before — history matters, and early choices can lock in long after…
- Preferential attachmentPreferential attachment is the tendency for those who already have more to gain still more — "the rich get richer." In networks and society, new connections, attention, or resources flow…
- Prisoner's dilemmaThe prisoner's dilemma is a game where two players each do better by betraying the other, so both betray and both end up worse than if they had cooperated.
- ReciprocityReciprocity is the deep social rule that we feel obliged to return what others give us — a favour, a gift, a concession.
- Red Queen effectThe Red Queen effect is the need to keep improving just to maintain your position, because competitors and the environment are improving too.
- RedundancyRedundancy is having backup capacity — spare parts, reserves, multiple pathways — so that the failure of one component doesn’t bring down the whole system.
- Regression to the meanRegression to the mean is the tendency for extreme results to be followed by more average ones, simply because luck evens out.
- Schelling pointA Schelling point is the choice people converge on when they must coordinate without communicating — the option that feels natural, obvious, or salient to everyone.
- Second-order thinkingSecond-order thinking is considering not just the immediate result of a decision but the consequences of those consequences — the “and then what?” effects that ripple out over time.
- Signal vs noiseThe signal-to-noise model distinguishes meaningful information (signal) from random, irrelevant fluctuation (noise).
- Skin in the gameSkin in the game means having a personal stake in an outcome — sharing in the losses, not just the gains.
- Social proofSocial proof is our tendency to decide what’s correct by watching what others do — especially under uncertainty.
- Streetlight effectThe streetlight effect is searching for answers where it’s easiest to look rather than where the answer actually is.
- Supply and demandSupply and demand is the model that prices and quantities are set by the interaction of how much sellers offer and how much buyers want.
- Survivorship biasSurvivorship bias is the error of drawing lessons only from the things that made it through some filter — the survivors — while the failures, which are invisible, silently distort the…
- Switching costsSwitching costs are the time, money, effort, and risk a customer must spend to move from one product to a competitor.
- Systems thinkingSystems thinking is understanding something by how its parts interact as a whole — through feedback loops, delays, and relationships — rather than analysing parts in isolation.
- The availability heuristicThe availability heuristic is our habit of judging how likely or common something is by how easily examples spring to mind.
- The black swanA black swan, in Nassim Taleb’s sense, is a rare event that is a huge surprise, carries enormous impact, and — only afterwards — gets explained as if it had been predictable.
- The cobra effectThe cobra effect is when an attempted solution makes the problem worse, because the incentive it creates is gamed.
- The Dunning–Kruger effectThe Dunning–Kruger effect is the finding that people with the least skill in an area tend to overrate their ability most — because the knowledge needed to do a task well is the same…
- The Eisenhower matrixThe Eisenhower matrix sorts tasks on two axes — urgent vs important — into four boxes: do now (urgent + important), schedule (important, not urgent), delegate (urgent, not important),…
- The endowment effectThe endowment effect is our tendency to value something more simply because we own it.
- The framing effectThe framing effect is the way the same facts, described differently, lead to different decisions.
- The gambler’s fallacyThe gambler’s fallacy is the mistaken belief that a run of one outcome makes the opposite “due.” After five reds on the roulette wheel, black feels overdue — but the wheel has no memory,…
- The halo effectThe halo effect is the way one strong impression — attractiveness, confidence, a single success — spills over and colours our judgment of unrelated qualities.
- The Lindy effectThe Lindy effect says that for non-perishable things — ideas, books, technologies — life expectancy grows with age.
- The map is not the territory“The map is not the territory” means any model, description, or belief is a simplified representation of reality — never reality itself.
- The OODA loopThe OODA loop is a decision cycle — Observe, Orient, Decide, Act — repeated continuously.
- The Overton windowThe Overton window is the range of ideas the public currently finds acceptable to discuss and enact.
- The Pareto principleThe Pareto principle — the 80/20 rule — observes that for many outcomes, roughly 80% of effects come from 20% of causes.
- The Peter principleThe Peter principle states that in a hierarchy, people tend to rise to their level of incompetence.
- The planning fallacyThe planning fallacy is our persistent tendency to underestimate how long a task will take, how much it will cost, and how likely it is to go wrong — even when we’ve been burned by…
- The Streisand effectThe Streisand effect is when trying to hide, remove, or censor information unintentionally draws far more attention to it.
- The sunk cost fallacyThe sunk cost fallacy is the pull to keep investing in something — money, time, effort — because of what you’ve already put in, rather than what it will return from here.
- The veil of ignoranceThe veil of ignorance is a thought experiment for fairness: design the rules of a society — or any deal — as if you didn’t know which position in it you’d occupy.
- Tragedy of the commonsThe tragedy of the commons is when individuals, each acting in their own rational self-interest, deplete a shared resource that everyone needs — because the benefit of overusing it is…
- Via negativaVia negativa is the principle that improvement often comes from removing the harmful, false, or unnecessary rather than adding something new.
- Zero-sum vs positive-sumA zero-sum game is one where one person’s gain is another’s exact loss — the pie is fixed.
Cognitive biases A–Z (72)
The predictable ways judgement goes wrong, and how to catch each one.
No cognitive biases match.
- Abilene paradoxThe Abilene paradox is when a group collectively agrees to a course of action that most or all of its members privately oppose, because each person wrongly assumes the others want it and…
- Action biasThe action bias is the tendency to favour doing something over doing nothing, even when action is no better — or worse — than waiting.
- Actor–observer biasThe actor–observer bias is our tendency to attribute our own actions to the situation but other people’s actions to their character.
- Affect heuristicThe affect heuristic is the mental shortcut of judging something — its risks, benefits, and merits — by the emotion it triggers rather than by analysis.
- Anchoring biasAnchoring bias is the tendency to rely too heavily on the first piece of information encountered — the “anchor” — when making decisions.
- Authority biasAuthority bias is the tendency to over-trust and obey an authority figure regardless of the content of what they say.
- Availability cascadeAn availability cascade is a self-reinforcing cycle in which an idea gains plausibility through sheer repetition in public discourse.
- Availability heuristicThe availability heuristic is judging how likely or frequent something is by how easily examples come to mind.
- Backfire effectThe backfire effect is when being shown evidence that contradicts a deeply held belief makes you hold that belief even more strongly, rather than revising it.
- Bandwagon effectThe bandwagon effect is the tendency to adopt beliefs or behaviours because many others already have.
- Barnum effectThe Barnum effect is the tendency to accept vague, general personality descriptions as uniquely accurate about yourself.
- Base-rate neglectBase-rate neglect is the tendency to ignore how common or rare something is (the base rate) and judge by specific, vivid details instead.
- Bias blind spotThe bias blind spot is the tendency to recognise cognitive biases in other people while failing to see them in yourself.
- Bystander effectThe bystander effect is the finding that an individual is less likely to help someone in trouble when other people are present, because responsibility feels shared and each person waits…
- Choice overloadChoice overload is the finding that too many options can make us less likely to decide, less satisfied with what we pick, and more prone to regret.
- Clustering illusionThe clustering illusion is the tendency to see patterns, streaks, or clusters in what is actually random data.
- Cognitive dissonanceCognitive dissonance is the mental discomfort of holding two conflicting beliefs, or of acting against your beliefs.
- Confirmation biasConfirmation bias is the tendency to seek, interpret, and remember information that confirms what you already believe, while discounting evidence that contradicts it — making beliefs…
- Contrast effectThe contrast effect is when our judgement of something shifts depending on what we compare it to.
- Dunning–Kruger effectThe Dunning–Kruger effect is the tendency for people with low competence in a domain to overestimate their ability — because the very skills needed to perform well are also the skills…
- Empathy gapThe empathy gap is the difficulty of understanding or predicting behaviour — your own or others’ — across different emotional or physical states.
- Endowment effectThe endowment effect is the tendency to value something more highly simply because you own it.
- False-consensus effectThe false-consensus effect is the tendency to overestimate how much other people share your beliefs, values, and behaviours.
- Framing effectThe framing effect is when the way information is presented — not its content — changes your decision.
- Frequency illusionThe frequency illusion is the experience of noticing something everywhere right after you first encounter it — a word, a car model, an idea.
- Fundamental attribution errorThe fundamental attribution error is the tendency to explain other people’s behaviour by their character but our own by circumstance.
- GroupthinkGroupthink is a pattern in which a close-knit group’s desire for harmony and agreement overrides realistic assessment of options, so members suppress doubts and reach a poor decision…
- Halo effectThe halo effect is letting one positive trait — often attractiveness, likability, or success in one area — color your overall judgement, so a good impression in one dimension spills over…
- Hawthorne effectThe Hawthorne effect is the change in people’s behaviour that happens because they know they are being watched or studied, rather than because of anything the observer actually changed.
- Hindsight biasHindsight bias is the tendency, after an event, to see it as having been predictable all along.
- Hot-hand fallacyThe hot-hand fallacy is the belief that someone who has succeeded several times in a row is "on a streak" and more likely to succeed again — even when each attempt is statistically…
- Hyperbolic discountingHyperbolic discounting is our tendency to prefer smaller rewards that arrive sooner over larger rewards that come later — and to do so far more steeply for near-term choices.
- Illusion of controlThe illusion of control is the tendency to overestimate how much influence you have over outcomes that are largely or entirely down to chance.
- Illusion of transparencyThe illusion of transparency is the tendency to overestimate how well others can perceive your inner states — your nervousness, feelings, or thoughts.
- Illusory correlationIllusory correlation is perceiving a relationship between two things when none exists, or seeing one far stronger than it really is.
- Illusory superiorityIllusory superiority is the tendency to overestimate your qualities relative to others — to rate yourself above average on skill, ethics, and judgement.
- Illusory truth effectThe illusory truth effect is the tendency to judge a statement as more likely to be true simply because it has been heard or read before.
- Impostor syndromeImpostor syndrome is a pattern of persistent self-doubt in which capable people feel their success is undeserved and fear being exposed as a fraud.
- In-group biasIn-group bias is the tendency to favour people we see as part of our group — and to be more critical or suspicious of outsiders.
- Just-world hypothesisThe just-world hypothesis is the tendency to believe the world is fundamentally fair — that people get what they deserve and deserve what they get.
- Loss aversionLoss aversion is the tendency to feel the pain of a loss about twice as strongly as the pleasure of an equivalent gain.
- Mandela effectThe Mandela effect is when many unconnected people share the same specific false memory, such as a logo, spelling or film line remembered in a way it never existed.
- Misinformation effectThe misinformation effect is the distortion of a memory by misleading information encountered after the event, so that people come to recall details that were suggested to them later…
- Negativity biasNegativity bias is the tendency for negative events, emotions, and information to affect us more strongly than equally intense positive ones.
- Nocebo effectThe nocebo effect is when negative expectations about a treatment or situation cause real unpleasant symptoms or make existing ones worse, even if the treatment itself is inert.
- Omission biasThe omission bias is the tendency to judge harmful actions as worse than equally harmful inactions.
- Optimism biasOptimism bias is the tendency to overestimate the likelihood of good outcomes and underestimate the bad — believing you’re personally less at risk than others of negative events, from…
- Overconfidence effectThe overconfidence effect is the gap between how accurate people think their judgements are and how accurate they actually are.
- Pessimism biasThe pessimism bias is the tendency to overestimate the likelihood of negative outcomes and underestimate positive ones — expecting things to turn out worse than they statistically do.
- Placebo effectThe placebo effect is an improvement in how a person feels after receiving a treatment with no active ingredient, such as a sugar pill or a sham procedure, because of their expectations…
- Primacy effectThe primacy effect is the tendency to remember and be most influenced by the first items in a sequence.
- Projection biasThe projection bias is the tendency to assume your future self will share your current preferences, emotions, and states.
- Pygmalion effectThe Pygmalion effect is when higher expectations placed on someone lead to better performance — and lower expectations to worse.
- ReactanceReactance is the urge to do the opposite of what you’re told when you feel your freedom of choice is being threatened.
- Recency biasRecency bias is the tendency to give the most recent events disproportionate weight in judgements and predictions — assuming what just happened will keep happening, while older but…
- Representativeness heuristicThe representativeness heuristic is judging the probability of something by how closely it matches a mental prototype, rather than by actual statistics.
- Self-fulfilling prophecyA self-fulfilling prophecy is a belief or prediction that, simply by being acted upon, brings about the outcome it predicted, even though the belief was false or unfounded when it was…
- Self-serving biasSelf-serving bias is the tendency to take credit for successes but blame failures on outside forces.
- Social desirability biasSocial desirability bias is the tendency of people answering surveys or interviews to give responses that will make them look good, over-reporting approved behaviour and under-reporting…
- Status-quo biasStatus-quo bias is the preference for things to stay the same — sticking with the current option or default simply because it’s the current one.
- Sunk-cost fallacyThe sunk-cost fallacy is continuing a course of action because of resources already invested — time, money, or effort — even when quitting would be the better choice.
- Survivorship biasSurvivorship bias is focusing on the people or things that made it through a selection process while overlooking those that didn’t — usually because the failures are invisible.
- The curse of knowledgeThe curse of knowledge is the difficulty experts have imagining what it’s like not to know what they know.
- The decoy effectThe decoy effect is when adding a third, deliberately inferior option changes which of the original two you prefer.
- The gambler’s fallacyThe gambler’s fallacy is the belief that past random events change the odds of future ones — that after a run of reds, black is "due." For independent events the probability resets every…
- The IKEA effectThe IKEA effect is the tendency to place disproportionately high value on things we partly made ourselves.
- The mere-exposure effectThe mere-exposure effect is the tendency to like things simply because they’re familiar.
- The ostrich effectThe ostrich effect is the tendency to avoid negative information — to "bury your head in the sand" rather than face something unpleasant.
- The peak-end ruleThe peak-end rule is the finding that we judge an experience largely by how it felt at its most intense moment (the peak) and at its end — not by the sum or average of the whole.
- The planning fallacyThe planning fallacy is the tendency to underestimate how long a task will take, how much it will cost, and how likely it is to go wrong — even when you know similar past tasks ran over.
- The spotlight effectThe spotlight effect is the tendency to overestimate how much others notice and judge you.
- The Zeigarnik effectThe Zeigarnik effect is the tendency to remember unfinished or interrupted tasks better than completed ones.
Logical fallacies (8)
Arguments that sound convincing but do not hold, and how to answer them fairly.
No logical fallacies match.
- Ad hominem fallacyAn ad hominem fallacy is rejecting an argument by attacking the person who made it, whether their character, motives or circumstances, instead of the reasons they gave.
- Appeal to authority fallacyAn appeal to authority fallacy is treating someone’s status or reputation as proof of a claim, especially when they are not expert in the subject or experts broadly disagree.
- False dilemma fallacyA false dilemma presents two options as the only possibilities when others exist, so that rejecting one seems to force acceptance of the other.
- No true Scotsman fallacyThe no true Scotsman fallacy is shielding a generalisation from a counter-example by redefining the group so that the counter-example no longer counts.
- Post hoc fallacy (post hoc ergo propter hoc)The post hoc fallacy is assuming that because one event followed another, the first must have caused the second.
- Red herring fallacyA red herring is an irrelevant point brought into a discussion that draws attention away from the real issue.
- Slippery slope fallacyThe slippery slope fallacy is claiming that one modest step will inevitably trigger a chain of further steps ending in disaster, without showing why each link in that chain is actually…
- Straw man fallacyA straw man fallacy is replacing someone’s actual argument with a weaker or exaggerated version, then refuting that version as if it were theirs.
Easy to confuse (47)
Two ideas side by side: what each one says and when to use which.
No comparisons match.
- Amor Fati vs Eternal RecurrenceBoth are Nietzsche's, and they fit together: eternal recurrence is the thought experiment — could you will your exact life to repeat forever?
- Anchoring vs FramingBoth show that how information is presented bends our judgement.
- Antifragility vs Margin of SafetyBoth prepare you for an uncertain world.
- Antifragility vs the Lindy EffectBoth come from Nassim Taleb and concern surviving disorder.
- Availability Heuristic vs Base-Rate NeglectBoth distort how we judge probability, via different shortcuts.
- Bandwagon Effect vs Authority BiasBoth are conformity pressures with different sources.
- Bayesian Thinking vs Base-Rate NeglectThese are the cure and the disease.
- Bayesian Thinking vs Occam's RazorBoth guide which explanation to believe, by different criteria.
- Categorical Imperative vs Amor FatiTwo opposite answers to 'how should I live?' Kant's categorical imperative says act only on principles you could will as a universal law — duty above desire.
- Choice Overload vs the Decoy EffectBoth show that how options are arranged changes our decisions.
- Circle of Competence vs Dunning–Kruger EffectThe circle of competence is a discipline — knowing the boundary of what you truly understand and staying inside it.
- Circle of Competence vs The Map Is Not the TerritoryTwo disciplines of intellectual humility.
- Compounding vs the Lindy EffectBoth are about time but make different bets.
- Compounding vs the Pareto PrincipleBoth explain why outcomes are non-linear, in different shapes.
- Curse of Knowledge vs Spotlight EffectBoth are failures to model other minds.
- Dunning–Kruger Effect vs Overconfidence EffectBoth describe confidence outrunning ability — but Dunning–Kruger is specifically that the LEAST skilled overestimate themselves the most, because the skill to perform and the skill to…
- Dunning–Kruger vs Illusory SuperiorityIllusory superiority is the broad tendency to rate yourself above average — most people believe they're better-than-average drivers.
- Existentialism vs TaoismExistentialism and Taoism both reject any meaning imposed from outside — but Existentialism answers by asserting the self, creating meaning through deliberate choice, while Taoism…
- First-Principles vs Second-Order ThinkingBoth cut against shallow reasoning, in different directions.
- Gambler's Fallacy vs Regression to the MeanBoth concern streaks and randomness, but one is an error and one is real.
- Halo Effect vs Fundamental Attribution ErrorBoth warp how we judge people.
- Hindsight Bias vs Confirmation BiasBoth corrupt how we handle evidence at different times.
- IKEA Effect vs Sunk Cost FallacyBoth attach us to things through our own investment, differently.
- In-Group Bias vs Bandwagon EffectBoth bend belief through other people, differently.
- Inversion vs First-Principles ThinkingBoth are reasoning tools that escape conventional thinking, from opposite ends.
- Inversion vs Second-Order ThinkingBoth improve decisions by looking beyond the obvious, differently.
- Kant vs NietzscheKant and Nietzsche are modern ethics' opposite poles: Kant grounds morality in universal reason and duty — the categorical imperative binds everyone equally — while Nietzsche rejects…
- Marcus Aurelius vs NietzscheTwo philosophers of fate and suffering who reach opposite conclusions.
- Mere-Exposure Effect vs Halo EffectBoth make us like things for the wrong reasons.
- Negativity Bias vs Loss AversionClosely related but distinct.
- Nietzsche vs JungNietzsche and Jung both mapped the dark, instinctual depths beneath reason — but Nietzsche, the philosopher, urged self-overcoming and affirmation, while Jung, the psychologist, urged…
- Occam's Razor vs Hanlon's RazorBoth are 'razors' — rules for trimming unlikely explanations.
- Ostrich Effect vs Confirmation BiasBoth protect a comfortable belief, by different means.
- Pareto Principle vs Systems ThinkingBoth help you focus effort in a complex world, differently.
- Peak-End Rule vs Recency BiasBoth shape how we remember experiences, differently.
- Planning Fallacy vs Optimism BiasOptimism bias is the broad tendency to expect better outcomes for yourself than the evidence warrants.
- Plato vs NietzschePlato and Nietzsche are philosophy's great antagonists.
- Recency Bias vs Anchoring BiasBoth let one piece of information dominate, from opposite ends of a sequence.
- Self-Serving Bias vs Fundamental Attribution ErrorTwo attribution errors that flatter us in opposite directions.
- Status-Quo Bias vs Loss AversionLoss aversion is the root; status-quo bias is a symptom.
- Stoicism vs ExistentialismStoicism and Existentialism both face a universe indifferent to human wishes — but Stoicism counsels accepting what you cannot control and living in accord with a rational order, while…
- Stoicism vs TaoismStoicism and Taoism both deliver freedom from anxiety and peace with what is — but Stoicism arrives through reason and disciplined judgement aligned with a rational cosmos, while Taoism…
- Sunk Cost vs Opportunity CostSunk cost is money or effort already spent and unrecoverable; opportunity cost is the value of the best alternative you give up by choosing one path.
- Survivorship Bias vs the Lindy EffectBoth concern what endures — one an error, one a heuristic.
- Systems Thinking vs Second-Order ThinkingBoth fight tunnel vision, in different planes.
- The Map Is Not the Territory vs First-Principles ThinkingBoth warn against mistaking ideas for reality.
- Wu Wei vs Amor FatiTwo ways to make peace with reality from opposite traditions.
Today’s text
Mujina
Tokyo, a dark slope, a weeping woman who will not show her face. Hearn's most famous ghost story, whole.
3 min · Lafcadio Hearn · Kwaidan: Stories and Studies of Strange Things · 1904 · public domain
On the Akasaka Road, in Tōkyō, there is a slope called Kii-no-kuni-zaka,—which means the Slope of the Province of Kii. I do not know why it is called the Slope of the Province of Kii. On one side of this slope you see an ancient moat, deep and very wide, with high green banks rising up to some place of gardens;—and on the other side of the road extend the long and lofty walls of an imperial palace. Before the era of street-lamps and jinrikishas, this neighborhood was very lonesome after dark; and belated pedestrians would go miles out of their way rather than mount the Kii-no-kuni-zaka, alone, after sunset.
All because of a Mujina that used to walk there.
The last man who saw the Mujina was an old merchant of the Kyōbashi quarter, who died about thirty years ago. This is the story, as he told it:—
One night, at a late hour, he was hurrying up the Kii-no-kuni-zaka, when he perceived a woman crouching by the moat, all alone, and weeping bitterly. Fearing that she intended to drown herself, he stopped to offer her any assistance or consolation in his power. She appeared to be a slight and graceful person, handsomely dressed; and her hair was arranged like that of a young girl of good family. “O-jochū,” he exclaimed, approaching her,—“O-jochū, do not cry like that!... Tell me what the trouble is; and if there be any way to help you, I shall be glad to help you.” (He really meant what he said; for he was a very kind man.) But she continued to weep,—hiding her face from him with one of her long sleeves. “O-jochū,” he said again, as gently as he could,—“please, please listen to me!... This is no place for a young lady at night! Do not cry, I implore you!—only tell me how I may be of some help to you!” Slowly she rose up, but turned her back to him, and continued to moan and sob behind her sleeve. He laid his hand lightly upon her shoulder, and pleaded:—“O-jochū!—O-jochū!—O-jochū!... Listen to me, just for one little moment!... O-jochū!—O-jochū!”... Then that O-jochū turned around, and dropped her sleeve, and stroked her face with her hand;—and the man saw that she had no eyes or nose or mouth,—and he screamed and ran away.
Up Kii-no-kuni-zaka he ran and ran; and all was black and empty before him. On and on he ran, never daring to look back; and at last he saw a lantern, so far away that it looked like the gleam of a firefly; and he made for it. It proved to be only the lantern of an itinerant soba-seller, who had set down his stand by the road-side; but any light and any human companionship was good after that experience; and he flung himself down at the feet of the soba-seller, crying out, “Ah!—aa!!—aa!!!”...
“Koré! koré!” roughly exclaimed the soba-man. “Here! what is the matter with you? Anybody hurt you?”
“No—nobody hurt me,” panted the other,—“only... Ah!—aa!”
“—Only scared you?” queried the peddler, unsympathetically. “Robbers?”
“Not robbers,—not robbers,” gasped the terrified man... “I saw... I saw a woman—by the moat;—and she showed me... Ah! I cannot tell you what she showed me!”...
“Hé! Was it anything like THIS that she showed you?” cried the soba-man, stroking his own face—which therewith became like unto an Egg... And, simultaneously, the light went out.
From Kwaidan: Stories and Studies of Strange Things. Public domain. Read the whole book free.
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