Don Steward posted this [url=https://donsteward.blogspot.com/2019/09/a-keith-richardson-jones-picture.html]fascinating analysis[/url] of a Keith Richardson-Jones drawing in the Tate. I thought it was a good one to adapt and try to generalize. [br][br]This imagines a square with n points on a side (well, n+1, but n distinct) and numbers then 1, 2, ... 4n. Then it draws a segment from point a to point b, and shifts the endpoints by h1 and h2 respectively, in one direction. Then makes another set starting from c to d, shifted by v1 and v2, in the other direction. [br][br]Fun effect to play with! But not very intuitive controls - sorry.