Why Are So Many Old Art Exhibitions Being Revived?

The Armory Show of 1913, Hitler’s 1937 “Degenerate Art” exhibition, MoMA’s The Photographic Object 1970, the 1966 show that introduced America to Minimalism, the infamous human zoo from 1914, and numerous others – why recreate entire assemblages by other curators, and why now? (Yes, of course there are good reasons.)