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Philosophy

Possible Worlds and Modal Realism

Quick fact

Modal realism, defended by philosopher David Lewis, posits that every possible world – even those where dinosaurs never went extinct – is just as concrete and real as the one we inhabit.

Why this is interesting

We often say 'it might have been otherwise' – but what does that really mean? Is there a sense in which other realities truly exist, right now, just out of reach?