Would Kant's Dove Fly Better in Empty Space?
In the introduction to the *Critique of Pure Reason*, Kant pictures a dove that feels the air pushing against its wings and imagines it would fly better without any air at all, and says that this is what Plato did when he left the world of the senses for the world of ideas. This explainer takes the figure apart: what the dove is supposed to show about reason and experience, why the physics makes Kant's point better than Kant says, where the comparison fits Plato and where Plato had already made it himself, and how the dove became, in Wittgenstein, a philosopher on ice who wants to walk.