We're, in spite of everything, bipeds -- we stand and move on two legs. The unique Khet sport had two non-obligatory expansions: the attention of Horus beam-splitter, which divided a laser into two beams, and the Tower of Kadesh, which introduced a second level of vertical play to the board. Suspend a string between two factors, pull it tight after which snap it along with your finger. Take an analogous string, mount it to a guitar and then pluck it. These are sketched out both on paper or usin...