The man on the picture is the German author Johann Wolfgang von Goethe. His most famous work is doubtlessly Faust, but apart from writing poetry and novels, he was also interested in science and in 1810 he published the color theory I'm referring to in the picture. The triangle in the image is an important part of his theory. He held that the colours at the vertices of the triangle (blue, red and yellow) were the three primary ones, all other colours being mixes of those three. The allusion to Andy Warhol I made simply because he was interested in Goethes theory and painted a portrait of him. If you're interested you can have alook at it here: http://www-user.tu-chemnitz.de/~adams/pop-art/slide-2.2.html