Sort of underway by then He was sort of underway by then...he had this whole ritual for showing the work to people – you had to sit in a chair that was positioned what he felt was exactly the right distance from the painting. There was a certain mystique about it that worked for him. Craig Kauffman, Robert Irwin: A Conditional Art ritualmystery
Truchet Tiles Truchet tiles are square tiles decorated with patterns that are not rotationally symmetric. When placed in a square tiling of the plane, they can form varied patterns, and the orientation of each tile can be used to visualize information associated with the tile's position within the tiling. Wikipedia en.wikipedia.org The Tiling Patterns of Sebastien Truchet and the Topology of Structural HierarchyWang tiles graphicsart