Mind structures reality, at least subjectively.
I think a more precise way of verbalize it is that mind structures a model of reality (subjective). Unless by that you mean the God-like mind that literally structures reality. I think we have to make a distinction between subjective experience of something and the thing itself. In plato's terms... shadows on the cave wall, etc. The observers don't structure the shadows on the cave's walls. It's a different kind of structure that's derived from "nomenon". But I would be in agreement with Whitehead and, perhaps you also, that these "nomenon" structures do end up structuring our subjective ones. But that's not what I'm talking about, hence I think you are misunderstanding my point. Maybe not, but it seems like it.
Even granting the Kantian distinction between noumena and phenomena, you cannot invoke the concept of categories of thought at all without saying something substantial about reality as it actually is.
I'm not sure that we care or can tell anything actual about reality beyond ratio-metic data that we can derive by comparing several different modes of perception. That's what science is about. It tells us the differential description of reality in terms of ratios between consistently perceived phenomena.
In that sense, yes... we have comparative categorization that reflects something about the nature of reality, of course. But that's not what I was objecting to.
A statement is not the same as a thought. A statement is a placeholder for a thought. Again, most of our communication is generic, in such it "begs" structure. It can't exist on its own, apart from mental framework that such statement is derived from. In such we don't communicate the content of our thoughts. We project meaning on any given statement, with hope that such meaning is consistent, which it is not beyond some nominal basics.
Mind structures reality, at least subjectively. That is all well and good, but it is not a subjective statement. We can step outside of our web of self-referential concepts far enough to know that processes that structure reality are an objective element of the external world. Perhaps we cannot say anything else about these processes without running into conceptual traps, but we can at least know that structuring processes exist beyond our already structured subjective realities. This is not a pattern; it is knowledge of the noumena.
I'm not sure how we can know that, unless you equivocate axiomatic assumptions with knowledge. I think these would be in the category of necessary beliefs that provide foundations for knowledge.
You'd have to elaborate on what you mean by "we can step outside of our web of self-referential concepts". In which way? By means of consensus? Why would that be different? You can appeal to some reliability in context of consistent perception, but how would that be stepping outside of that network?
If you have 20 black and white cameras that all consistently reproduce black and white image... would that mean that world lacks color beyond the shades of grey?
If you are not appealing to consensus, I'd like to understand how you derive that knowledge beyond assuming certain axiomatic necessities.
Therefore, I would say that the phenomena itself is not entirely separate from the noumena, since the latter gives rise to the former, and our ability to look back and grasp reality gives us a window into it, even if that window is mediated by mental images and concepts.
The fact that those mental images and concepts exist by itself says something about external reality. To deny this is also to say something substantial about the noumena, which you are not allowed to do.
I would say that it's not separate at all, since I don't ascribe to dualism, and I'm assuming that mind is a subset process of reality as a "parent process". My assumption is that both occupy the same reality.
But, the issue in context of the "process chain" is that what we call "Statement" is detached from "nomenon" since it's not a product of the "nomenon", but of the mind that experienced it. The "aboutness" in that context is a conceptual model as opposed to "reflection".
Consider a statement like "Сейчас идет дождь". It's meaningless to you. It's meaningful to me, but it doesn't reflect my current perception of reality. It may reflect a certain context of reality given that the perception context to which statement is linked to is present, but it's not at this time.
So again, you have Reality ----------> Conceptual model -----------> Statement
But if you try to reverse that Statement -----------> Conceptual model ----------> Reality
It just doesn't work as well. The best you can claim is that statement reflects some conceptual model and that such model reflects reality, but it's not a given.