What is mysterious to me is why and how chemical reactions in a certain part of my brain create an experience of blue.
Yes some chemical change happened there, but so what.
These are not very unusual chemical reactions. They happen and are happening everywhere. Does all the chemical reactions going on generate an experience to some experiencer?
I think the flaw in your reasoning is the assumption that chemical reaction is causing the sensation of blue.
But imagine if the consciousness and what it senses cannot be separated. So the consciousness sensing blue and the chemical reaction happening in the brain, are just correlated. One did not cause the other.
One can ask where that correlation came from. I think that the such correlations are inherent in such worlds where consciousness is possible.
I think everything that we observe as physical laws, causality etc, are just such correlations.
This is where these questions take me. Since the experience is the only thing I can be certain of, I'm less drawn to "everything is physical" answers and more drawn to ideas from phenomenology and Bishop George Berkeley. And since I'm not super religious, I'm not really comfortable with those "answers" either.
Yes some chemical change happened there, but so what.
These are not very unusual chemical reactions. They happen and are happening everywhere. Does all the chemical reactions going on generate an experience to some experiencer?