Emanuel Kant's Transcendental Idealism is the view that we can never know reality directly (the noumenon), we only know how it appears to us (the phenomenon). Kant made this distinction based on observation, I believe. You cannot invent such a theory out of thin air. Yet many people have wandered off in imagination, offering all kinds of abstract ideas to explain this theory. — Carlo Roosen
It's Immanuel.
I will try to bring this topic back to something everyone can validate on his/her own. I will use the terms fundamental reality and conceptual reality, simply because I get confused by Kant's terms.
I appreciate the attempt to make Kant's terms clearer. Though I think you're dealing with the more general dichotomy between representation (conceptual reality) and represented (fundamental reality). Rather than the one between phenomenon (conceptual reality, representation) and thing-in-itself or noumenon. The distinction in Kant, or pair of distinctions - between phenomenon and noumenon, or phenomenon and things-in-themselves, doesn't neatly map onto the concept of representation and represented. The things-in-themselves are alien to any conceptual apparatus or system of perception, whereas the represented can be more or less adequately grasped by a representation.
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You will agree that our conceptual detection system is at work and recognizes this as a pattern forming the letter E. Eat two cookies and now it looks like this:
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Our conceptual detection system does not wonder where the E has gone. It is now simply the letter F. Next you eat all cookies except the last one. All the letters are gone, only a single cookie is left. No big deal.
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You will likely agree that the E and F were created in your mind, as a part of your conceptual reality. Fundamental reality provided all the input for that abstraction, no misunderstanding about that. But it is the mind that recognizes the input as patterns and gives it these labels E and F.
The driving force of this paragraph is the phrase "created in your mind", which you could read substantially or relationally. Substantially, insofar as a representation (item of conceptual reality) is part of your mind while perciving the cookie configurations, or relationally insofar as the perception of the configuration results in classifying the configuration as a given letter. NB that someone who had no concept of the letters E or F would be able to see the relative positions and numbers of cookies, and you were also able to bring about a change in the represented (cookie placement) in order to elicit an expected change in our aggregate representations (letter classification). The significance of this is that you've used a representation to elicit an expected change in the un-represented by using a concept - which would be very odd if the represented is somehow beyond relation to conceptualisation as a process.
Also notice that during the time you were looking at the E and F, the concept “cookies” was most likely at the background of your mind, although you did perceive them perfectly well. Another sign that perception and concept are not the same thing.
"background of your mind" is also allegorical. You seem to be equating that with a degree of cognitive awareness of the label of the percept - being cognisant of the fact that if I see
that configuration, I may assert "that configuration is E". Whereas the latter step of assertion is potentiated but not required by the classification. That matter since you would need to establish that concepts did not saturate both steps. As far as I know concepts do saturate both steps, and they do for Kant as well as contemporary accounts of perception.
Now take the remaining cookie and look at it. In the hierarchy of concepts we go one level deeper, so to speak. Look at the single cookie. For some reason it is more difficult to say that the cookie is a pattern detected in your mind by your conceptual detection system. It is a cookie, that is how it feels.
The level of description that you applied to the cookie configurations is not the level of description you would apply to the single cookie - since the cookie configuration concept requires relations between distinct cookies, and there is one. You can take a different concept - say "marks on page", "distribution of pixels" - and describe the cookie in those terms. Those concepts do not have a hierarchical dependence, since both letter cookie configurations and single cookie configurations can be described in terms of the properties of marks on a page - when one judges markings on a page, one does not need to judge letters and vice versa.
I believe there is actually no difference between the patterns E and F and a cookie. Just like the two letters, the cookie is something our brain recognizes as a separate object, searches the appropriate label for and finds the word “cookie”. All the information is out there, the recognition and labeling is only in our minds.
One type of information is out there - the spatial properties of the page marks. Whatever goes into recognising the marks as E or as F, or indeed as a letter, is a relationship between the marks and the perceiver's learning. It need not be in the page or the perceiver's mind, it can be interpreted as an element of the relation between them.
Everything that can be said about this cookie, its taste and its color, finds its origin in the reality outside, the fundamental reality. It is inside the mind where the recognition and the labeling happens, which is the conceptual reality.
You can go down more and more levels, until you are at the particle level. Do all the particles in the universe then form this "fundamental reality"? I don't think so. Observe what happens in your mind. Just like "Letters E and F" and "cookies", you now have a label "all the particles in the universe", defined by your current perspective of reality. Still just a concept in your mind, no different than the letters or the cookies.
This hasn't distinguished the fundamental reality from the lower levels of the conceptual hierarchy you stipulated - is fundamental reality at the bottom? If it's like the thing in itself, that fundamental level is unconceptualisable, so how could some concept be closer to it?
Many philosophers have been struggling with this, but this is really all there is to it, I believe. — Carlo Roosen
One reason philosophers struggle with this is that it's incredibly hard to make an account of it, given all the stuff that's going on, the biases involved in introspection, and pinning down the meaning of concepts. To be frank, the imprecisions in your key terms and relations "created in your mind", "object", "hierarchy", "conceptual", "fundamental" are what's doing the work in appearing to solve the problem. Your account is evocative but its imprecisions leave fatal gaps that ensnare it in the problems you've sought to escape.
Which isn't a bad thing, you're just among the bad company of fellow travellers.