Actually the reflecting physical attributes are waves. Science has not explained how our brains create color. It simply has gotten to the point where it says different cells (cones) react to different wavelengths differently resulting in a chemical response in the brain. The mechanism of action behind how the perception of color is formed in the brain is unknown.
If the brain does assign colors to different waves, and creates these completely novel entities that exist outside an objective universe, then the brain has a special power to create new things out of nothing. To me that's magic.
However let's assume that is correct. Then the materialist model simply will have to state that all qualia are at least partly hallucinations then, because an illusion is the interpretation of the data given to the brain. A hallucination is the creation of perceptions without sensations. And color is the creation of a new perception completely different from the sensation of light, as the sensation of light itself is simply a wave. Without color. Are you willing to make that claim? Because if you are then you have opened up a new can of worms, considering how hallucinations themselves are a very poorly understood topic. And that what we refer to as reality, is wrong.
Color is an illusion because matter doesn't look a certain color, it just reflects light waves based on the frequency that the atoms are vibrating at. Color is the next best thing to seeing frequency numbers coming off of the atoms. In a similar way we don't know know what infrared looks like yet we have computers generate a visual representation based on the heat of objects. Some animals can "see" heat and it would be nice if we could but realize that even if we can "see" heat we are just seeing a visual representation of it. Some people who have the color and letter/number sections of their brains crossed see numbers in certain colors for example all eights would look blue etc.
edit: The reason it isn't a hallucination is because does represent something physical. That physical thing isn't a hallucination.
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