I just uploaded a printable version of The Spectre, the chiral Einstein tile (a single shape that can tile the plane in a fascinating non-repeating pattern). This version is exactly 10 cm² and has a bold red face with a crisp white border for contrast. Great as a desk object, classroom math demo, puzzle piece, STEM gift, or geometric art project. It's super fun to assemble on your desk, but a bit distracting too! :D