In the underrated 1972 scifi film "Silent Running" there was a circular pool table complete with computer arm player, which became a source of interest into the math of chaos theory: http://fadesingh.tumblr.com/post/49428198268/the-billiards-o... and even inspired other variations like a hexagonal table: http://switchgaming.blogspot.co.uk/2014/02/accessible-pool.h...