This is a tiling system! Click-and-drag on the pulsing white line to add points to it, click on the colour swatches in the panel to assign different colours to the tiles, and have fun!
I’m a big fan of M.C. Escher’s work - in particular the tessellations – and have always wanted to come up with a way to handle the difficult-but-mechanical task of making sure that the tiles actually match up properly. It’s a reasonably simple problem, so while the internet was disconnected this weekend I tried to build it, and so far it seems to be working! I’d be very interested in either animating a blend from one set of points to another, or blending over distance (like something in Escher’s Metamorphosis series.) In any case, I 1. Have had a a great time with it and 2. thought other people would like it too. I hope that that is the case!