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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.

46 votes

When is 2 qualitatively different from 3?

Infinitely many regular polygons in dimension 2, five regular polyhedra in dimension 3.