A Truchet array is a square grid of geometric tiles, generating random seamless patterns. Each tile has either 2 or 4 alternative appearances, which are continuously displayed at random. The resulting patterns can appear quite complex. The idea was created by Sebastien Truchet, an eclectic monk born in 1729. He was a mathematician and designer who explored plane coverage using tileable elements. Truchet tiles have two different edges, left-right and top-bottom. When tiled in a chequer board layout, all tile edges will match and a seamless geometric pattern results