I have a fairly good understanding of colors, light, and how our eyes process them, including things like "why are wet spots on cloth darker?" and "why does mix

I have a fairly good understanding of colors, light, and how our eyes process them, including things like "why are wet spots on cloth darker?" and "why does mixing blue and green light yield cyan but mixing blue and green paint yield black?" These are all things that can be wiki'd, and somewhat simple to understand, but I think wrapping one's head around the first principles so you can answer any related question on human visual interpretations of light is valuable, and something I can try to explain if anyone is interested.