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Space and time

For Kant neither things nor properties of things in themselves, but the pure forms of our sensible intuition: everything that appears to us appears in space and time.

In the transcendental aesthetic, the first part of the “Critique of Pure Reason”, Kant argues that space and time are not empirical concepts abstracted from experience but a priori representations that first make experience possible. Everything that appears to us appears ordered in space and time.

Hence their double nature: empirical reality — within experience they hold without exception — combined with transcendental ideality — they do not belong to things in themselves. On this basis Kant also explains mathematics: geometry draws on the pure intuition of space, arithmetic on that of time.

Source: Wikipedia: Space and time