A thought experiment is philosophy's most elegant tool: a scenario stripped to the essential, designed to force a choice. The best ones don't dissolve when examined — they get harder. Here they receive the treatment they deserve: precise, honest, and unsatisfied with easy answers.
A contemporary version of Descartes' demon: if your brain were in a vat being fed artificial signals, how could you know? The scenario sharpens foundational questions about knowledge, reference, and the limits of radical skepticism.
Examine the argument →John Searle's 1980 thought experiment argues that a system manipulating symbols according to rules cannot be said to understand or have genuine intelligence, however convincingly it mimics comprehension.
Examine the argument →In 1867, James Clerk Maxwell imagined a tiny creature that could sort fast and slow molecules, seemingly violating the second law of thermodynamics — a puzzle that took a century to resolve and transformed our understanding of information, entropy, and the physical basis of knowledge.
Examine the argument →If every plank of Theseus' ship is gradually replaced, is it still the same ship? The oldest thought experiment in the Western tradition poses questions about identity, persistence, and what it means for anything — a ship, a person, an institution — to remain itself through change.
Examine the argument →First articulated by Philippa Foot in 1967 and extended by Judith Jarvis Thomson, the trolley problem forces a choice between killing one person to save five, exposing deep tensions in moral theory.
Examine the argument →