The most famous and mind-bending philosophical scenarios — from the trolley problem to the Chinese Room — that reveal deep truths about ethics, consciousness, and reality.
Would you plug into a machine that gives you perfect simulated happiness for the rest of your life? Nozick's experience machine is the definitive refutation of hedonistic utilitarianism — most people prefer real over simulated good.
If advanced civilisations can run ancestor simulations, and they would run many, the probability that we are in a simulation may be high. Bostrom's trilemma is the most provocative contemporary metaphysical argument.
Rawls' difference principle (inequalities only justified if they benefit the worst-off) versus Nozick's entitlement theory (any freely acquired holdings are just) defines the central debate in 20th-century political philosophy.
A cat in a sealed box with a quantum trigger is simultaneously alive and dead until observed — Schrödinger's paradox exposed the absurdity of Copenhagen quantum interpretation and spawned decades of philosophical physics debate.
Prisoners chained in a cave, mistaking shadows for reality — Plato's allegory of the cave is the most powerful metaphor for the difference between appearance and reality ever constructed. The foundation of epistemology.
What if an all-powerful demon is feeding you false perceptions of reality? Descartes' radical doubt stripped away all certainty except the existence of a thinking self — the foundational move of modern epistemology.
A person following rules to manipulate Chinese symbols produces correct Chinese responses without understanding a word — Searle's argument that syntax does not equal semantics remains the most debated challenge to strong AI.
Design a just society without knowing your position in it — rich, poor, male, female, any race. Rawls' veil of ignorance generates impartial principles of justice by removing self-interested bias from moral reasoning.
Mary knows everything about colour perception but has only seen black and white. When she sees red, does she learn something new? Jackson's thought experiment challenges physicalism about consciousness.
Should you divert a runaway trolley to kill one person and save five? The trolley problem and its many variants have become the most productive thought experiment in moral philosophy — distinguishing consequentialist from deontological ethics.
The Taoist sage dreamed he was a butterfly — upon waking, was he a man who dreamed of being a butterfly, or a butterfly now dreaming of being a man? The most elegant question about the boundary of self and reality.
If every plank of Theseus's ship is gradually replaced, is it still the same ship? The ancient identity paradox has been extended to personal identity — are you the same person you were ten years ago?
“The Experience Machine (Robert Nozick, 1974)”
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