Optical illusions show how we see | Beau Lotto

The same can be said about our brains too. What we think we see is quite different from what our eyes register (e.g., blind spot, hollow-face, colors on contrast backgrounds, etcc ▶ this video

Color, Color Science, color vision, reproduction, perception, etc. often surprises engineers when they realize how incredibly complex the subject can be. Many years ago I took a course on Color Science at the Rochester Institute of Technology. I was working in a domain where I realized I had to know more about this subject than I could learn on my own at the time. This has come up many time during my career (even today). I am so glad I took the time to learn more about this from the folks who, quite literally, wrote the books on the subject (Fairchild, etc.). Here's a fun video to watch: ▶ this video Another interesting topic to understand: link

I'm not sure I buy that it means there are more absolute viewable colors there, but rather there are merely different interpretations of the same colors. We do have fairly strong confirmation that our brain doesn't interpret color absolutely but can adjust based on luminescence (see: all examples of shadow illusions) and patterns (see: ▶ this video ), perhaps that's what is meant by a "fourth channel"?