Ideas on the subject. Or, more accurately, opinions. Or, more more accurately, a possibly inaccurate understanding of an EXCRUCIATINGLY complex speculative epistemological philosophy:
Kant is accepted as being ahead of his time in the physics of his day, but only from a theoretical approach. That is, he theorized, but didn’t experiment, and just because some of what he thought has been subsequently established by physical science, I don’t think the modern science community attributes much of its progress to him.
Awareness is the same as consciousness. To remove awareness is to remove the extant intuitions residing in consciousness of the object, which immediately deletes any experience of them. Removing the intuitions, however, does not remove the conditions under which it is possible to become aware of objects given from sense. These are the “something that remains” as the pure forms of intuition, of which there are only two, called space and time. They are not noumena, but pure a priori conceptions belonging to the mind, the deduction of which is both unknown and unnecessary, because no experience is at all possible without them.
There are two ways to cognize an object, either it is given by sense or it is thought by understanding. That which is unknowable in the sensible world is the thing-in-itself, that which is unknowable in the world of thought is the noumenon.
On empirical knowledge:
The as yet undetermined object given to sense is called phenomenon, and that which resides in consciousness that relates to it is intuition. Imagination unites phenomenon to its intuition, from which representation of an object arises, of which no true identity of the object is yet allowed, but to which now understanding has something to relate its conceptions.
That a determined object of extant experience can be cognized without being presented to sense is evident by the mere thought of it, and an undetermined object remains imaginable. But if an object is thought, there is no sensuous phenomenon with which intuition may be related, and therefore imagination must import a suitable object to use for the creation of its representations. Otherwise, there would be no consistency between an object of sense and the very same object merely thought. These relations are the conceptions belonging to understanding itself, and are deduced from experience even while not derived from an immediate instance thereof.
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On non-empirical knowledge:
There obviously arises in the mind conceptions for which no empirical object is possible, as is the case with “cause”, “substance”, “quality”, and such other pure conceptions. Because it is absurd to suppose the human cognitive system has two distinct methodologies to cope with two distinct kinds of knowledge, but rather it is very far more parsimonious to suppose there is but one method but with distinct components contained within it, or, which is worse, we are left with the reality of only one kind of knowledge, but by means of which it is absolutely impossible to explain how it is we really do know that things like “cause” and “quality” actually are comprehensible, effective and even necessary in our understanding of the world of sense.
Here of course, we are presented with a major problem, for we must exclude anything from our cognitions suggesting even the possibility of an object associated with an empirical conception, including the entire faculties of sensibility, intuition, imagination and most importantly, representation, yet holding with understanding and judgement, for even this method of cognizing is relational because of the type of rational being we are. It is here the transcendental deduction of, and the objective validity for, the pure categories are required, these being no more than the pure form of properties or attributes to which a concept would necessarily adhere if it were possible to think one. That is, for instance, if a thing is a cause it must be possible to conceive that it exists. If this be accepted, the method for the uniting the pure conceptions with......something....must happen, or there remains nothing to which judgement may apply, and no cognition would follow and we would have a cognition of what constitutes “cause”. Because we do think “cause”, consistently and intelligibly, it must be the case the concept relates to something. This something is a noumenon, and we have no idea what it is, but it must be something, because without it, no relation between a pure conception and a priori cognition is possible.
Ever wonder why it is, that we can cognize a multiplicity of properties for frying bacon, but we can’t intuit a smell for it. While science rightly declares the sensory apparatus precludes this information, the philosophy of speculative epistemology makes no such intuitive distinction. One of the most obvious requisites grounding our knowledge for this particular thing, has a missing intimate component. If it is possible to truthfully cognize frying bacon while missing an important consideration, it stands to reason it is possible to just as truthfully cognize a pure a priori conception without that which makes it possible.
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The root of the confusion:
Empirical Understanding has a thing (phenomenon) associated with it and an unknown thing-in-itself is associated with that phenomenon. Pure Understanding has an a priori thing (category) associated with it and a noumenon associated with that category, as its unknown thing-in-itself. They are not the same, not even close, even if they share a term meant to illustrate a similar quality of each.
For what it’s worth.