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The Library
of Alexandria

The Critique of Pure Reason, Part 5 summary

Part 5 of 79 · 4 min to read the part

In § 4. Conclusions from the Foregoing Conceptions, space is established as the subjective form of external intuition, not a property of things in themselves.

What happens

  1. Space does not describe properties or relations that belong to objects independently of subjective intuition.
  2. The mind’s receptivity precedes particular perceptions, allowing space to supply principles of external relations before experience.
  3. Spatial judgments hold universally for external phenomena, but their validity does not extend to things in themselves.
  4. Color, sound, and heat are sensations, unlike the pure intuition of space, and cannot supply comparable knowledge before experience.
  5. External objects are representations of sensibility, while what corresponds to them independently remains unknown through these representations.

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What to notice

The sentence joins the two central claims: spatial judgments apply to external experience, but space does not belong to objects independently of human sensibility.

Quick check

Why does the argument reject color as an adequate illustration of space’s ideality?

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