This philosopher discussed the "unity of apperception" in a book where he used arguments based on unprovable facts about the mind, called transcendental deductions. He distinguished the unreachable noumenon from the sensible 
This philosopher discussed the "unity of apperception" in a book where he used arguments based on unprovable facts about the mind, called transcendental deductions. He distinguished the unreachable noumenon from the sensible phenomenal world, and posited "man's emergence from self-imposed immaturity" in his essay "What is Enlightenment?" He forbid lying even to a murderer inquiring about one's best friend, discussed the beautiful and sublime in his aesthetic tract Critique of Judgment, and proved that synthetic a priori truths exist. For 10 points, name this formulator of the categorical imperative, a Prussian philosopher who wrote Critique of Pure Reason.
This philosopher discussed the "unity of apperception" in a book where he used arguments based on unprovable facts about the mind, called transcendental deductions.