Can you tell if a painting is Great ?

I looked at the guidebook...”...there are fourteen panels by Botticelli, Perugino” —all these great artists — ”and two by So–and–so, which are of no significance.” This was a terrific excitement to me, that I also could tell the difference between a beautiful work of art and one that’s not.

— Richard Feynman, Surely You’re Joking, Mr. Feynman!