Abstract: The color we see depends on physical as well as physiological parameters. During this talk Pupa will do several experiments, and you will experience and see the results for yourself. Whether you are an artist, a scientist, or simply have a curious mind, you will find this interesting: it will change all you already knew about color, primary colors, how color mixing works on a computer screen (additive) or in a color printer, a paint shop, or an artist's palette (subtractive), and how artists in the past have used color mixing, some more successfully than others.