César Baldaccini [France] (1921-1998) ~ "Compression", 1990. Plastic.
Harry Foundalis - The Bongard Problems
Bongard Problem #97
Bongard Problems: somehow related to some core aspect of intelligence. It's some kind of maximization in some predicate space of the simplicity of a predicate subject to that predicate separating the two classes? Vague because I don't know :(