It was one year ago today that David Smith emailed me out of the blue, asking about my work on computing Heesch numbers. A few days later he tipped his hand and showed me a drawing of the hat polykite for the first time. Happy Aperiodic Monotile day to all who celebrate.
@csk I remember, I immediately coded one tile with #turtlestitch and made some of these tiles with lasercutter and 3D printer, to explain teacher colleagues and students what it is about.