Tangloids is a mathematical game for two players created by Piet Hein to model the calculus of spinors.
Tangloids apparatus
Piet Hein was a Danish polymath, often writing under the Old Norse pseudonym Kumbel, meaning "tombstone". His short poems, known as gruks or grooks, first started to appear in the daily newspaper Politiken shortly after the German occupation of Denmark in April 1940 under the pseudonym "Kumbel Kumbell". He also invented the Soma cube and the board game Hex.
Piet Hein (Kumbel) in front of the H.C. Andersen statue in Kongens Have, Copenhagen, 1983
Piet Hein's superegg in brass