Transcendence
Kant's main Critique of Pure Reason is essentially that pure reason often excludes true knowledge derived from appreciating concepts which, if properly appreciated, bring the mind into states of transcendental awakening that can be synthesized with the philosophy of pure reason alone. This book sits at one of the most important cross-roads within all philosophy: is there a transcendental experience of the human mind, or are all the mystics and sages simply deceiving themselves? Kant says that ironically, the transcendental imagery is much more simple and obvious than some people make it out to be.
Philosophical construction
Kant's thoughts portrait a lattice of philosophical construction using mathematical syllogism to build a framework of arguments that, taken together, can be seen as an important proof in the transcendental nature of reality. This is especially pronounced because Kant analyzes the process of deriving true ideas within his treatment of the human mind. In other words, he is performing a task and also explaining the authority of that performance. This sounds complicated, but it boils down to something simple: Kant describes the imagery of having a mind.
Spare deduction
So, if he is constructing, is Kant also deconstructing? This question has two answers, both of which are evidenced by imagery: Yes, Kant practices deconstruction and construction in a delicate and mathematically precise manner that he calls "Transcendental Dialectic." Also, it is additionally helpful to his philosophy that he starts pretty close to tabula rasa. His absolute skepticism about the philosophies of other people makes his ideas a pure treatment of consciousness, without respect for any belief system found within the realm of human experience. It is pure.
Time and sensory perception
Instead of deriving his ideas from within a passive acceptance of time and space, he starts at the claims of Cartesian Dualism, commenting not about what is being perceived, but what it means that we are perceiving in the first place. This might remind the reader of Plato's "Allegory of the Cave" in The Republic. Kant portrays in his philosophy what the ideas might be of a person who has attained transcendental enlightenment with respect to reality and their experience of animal existence on this strange ball in space.
