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I have to say that although I know that we perceive colors differently, at first I didn't want to believe colors are the construction of the brain. I used to think the wavelengths of the photons are the "physical basis" of colors, and our different perception of them is due to the limitation of our body structure. Our last class completely changed my vision. Now I do see the point, and it actually helps me understand the chromatics better. It's fascinating that our eyes can distinguish so many colors.  I do graphic design with computer sometimes, and I know there is a big difference between the color spaces on computer and in print - and the range of colors we can see is much wider than both systems'. People in the color space business are constantly expanding the color space by finding ways to show the colors we have never produced.

I also find the discussion about binocular stereopsis very interesting. My right eye has been shortsighted for a long time, but since my left eye is normal, I don't wear glasses. So I'm actually looking at things with one eye. Somtimes it does affect my sense of space (for example, I can't play badminton because I can't tell the distance very accurately), but for most of the time I'm doing fine. I wonder what the other ways we have to sense the depth. Also, what is the role of our experience in this?