The 2019 Bridges mathematical art gallery is online! http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings

Lots of good stuff in there...in https://twitter.com/bit_player/status/1086463227154915329, Brian Hayes lists his favorites as being the warped notepaper of Matt Enlow (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/unsolvedmre) and the Penrose quilt of Douglas G. Burkholder (http://gallery.bridgesmathart.org/exhibitions/2019-joint-mathematics-meetings/burkholderd)