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Appearances vs. things-in-themselves
💡 We can only know phenomena (things as they appear through our faculties); the noumenon, or thing-in-itself, lies permanently beyond human knowledge.
If the mind supplies space, time, and the categories, then everything we know is already shaped by them. Kant draws the momentous conclusion: we only ever know phenomena — things as they appear to beings with our cognitive equipment. What things are in themselves, apart from all human structuring, he calls noumena — and these remain forever beyond our knowledge.
This is not skepticism about the world. The world of appearances is fully real and lawful; science studies it with complete legitimacy. The point is that reality-as-experienced and reality-as-it-is-in-itself are not the same thing, and we can never step outside our own faculties to compare them.
Here is roughly how knowledge gets built, and where the boundary falls:
We are, in effect, locked inside the theater of appearances — able to know its every law, but never the actors offstage.
Source: Critique of Pure Reason — Immanuel Kant