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 Am I the only one who sees this rather as a t-shirt, not a hat? It's inverted in this picture. The t-shirt has a very nice v-neck and an interesting uneven bottom.
@sverik Lots of people see a t-shirt, including us when we were first playing around with the shape. In the end I concluded that "hat" was a little nicer to write in an academic paper.