Index of Bongard Problems

http://www.foundalis.com/res/bps/bpidx.htm
Index of Bongard Problems

Complexity: 7 Rating: 8

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this is absolutely brilliant. https://en.wikipedia.org/wiki/Bongard_problem

The idea of a Bongard problem is to present two sets of relatively simple diagrams, say A and B. All the diagrams from set A have a common factor or attribute, which is lacking in all the diagrams of set B. The problem is to find, or to formulate, convincingly, the common factor. The problems were popularised by their occurrence in the 1979 book Gödel, Escher, Bach by Douglas Hofstadter, himself a composer of Bongard problems