»I don’t know how to write a computer program that will tell me if an image is beautiful or not. But I know when something affects me and when it doesn’t. Sometimes I’m quite sure that, to me, I’m looking at an object of art. But don’t ask me to quantify it, like Birkoff tried to do. As far as I know, art belongs to the spirit realm.«

Donald Knuth

Manfred Mohr, P-200/201 CB2, 1977-78