Earlier quoted context omitted.
> Your mind and your body are the same thing. That is incorrect, but unfortunately a very common misunderstanding. The mind is highly correlated with the brain but it is not the brain. It’s easy to see this is the case because the brain is made up of a qualitatively different material than the mind. While the brain is composed of biological cells / chemistry / atoms, the mind is composed of things like sense-percepti…
Your argument falls apart where you claim something is abundantly clear, when you can't even clearly describe what you think is abundantly clear. You're claiming red light isn't the perception of red. I can be on board with those semantics, but they are just semantics. In that case, I'd say the phenomenon described by the terms is that red light is the electromagnetic radiation in the long range of the visible spectr…
> the perception of red is the chemical cascade starting with the stimulation of L-cones and ending with the firing of neurons in the visual cortex.
So this quote illustrates the gist of your thinking, but I think you've got some muddled terms. For you there is "red light" and "the perception of red". So for you:
"red light" is the photon & "the perception of red" is the chemical cascade.
Whereas, I would break it down as follows:
"red light" is the photon as well - ie a photon with wavelength between 620-750nm (though I'd caution that despite calling this photon "red light", there is in fact no "red" associated with it - except that it can cause the perception of red if it hits and excites specific cone cells at back our eyes, but it is still just a photon, albiet with a specific energy level but the point is this photon has no quality "red")
Where we differ is I believe:
The chemical cascade is the chemical cascade & "the perception of red" is "the perception of red"
So I think the real problem with your understanding of this is your confusing the chemical cascade caused by a 620-750nm photon to be "the perception of red".
In a sense, you are claiming that this chemical cascade is 2 things: 1: a chemical cascade and 2: the perception of red (i.e. the subjective sensation of looking at red); whereas, I would say the chemical cascade is just a chemical cascade... that's all it is, because of course chemicals can't be chemicals AND sense perceptions - that's the real incorrect leap of faith in your argument.
I believe it makes much more sense to consider sense perceptions to be a separate distinct phenomenon. You say that I have yet to present an observable phenomenon that is clearly in the mind, but just imagine a red triangle, boom there you have it - that red triangle only exists in the mind. Sure, in the brain there's electrochemical activity within the visual cortex, but you won't find a red triangle in there, because the red triangle is made up of fundamentally different material - i.e. the sense-perception of red in the shape of a triangle. Now, I have no idea what red actually is, except that I know it is a qualitatively different material than the brain and is fundamentally irreducible.
If you still disagree with this, tell me where is the red triangle? Because I think it's patently absurd to say the red triangle IS a chemical cascade in your brain. No, it's not. It's highly correlated with a chemical cascade in your brain, but it is an objectively distinct and separate entity/object; it's simply made of qualitatively different material than the brain. Ultimately, as I said before, I believe you're confusing 2 correlated processes/things for a single process/thing: the chemical cascade and the sense-perception.