Christopher Danielson’s Blog


A 21st Century Challenge

After seeing Hana Murray's lovely study of rectangles made from 21st Century Pattern Blocks, I started playing and noticed that many of them seemed to involve the small green triangles. Pretty soon, I had formed a conjecture. Using copies of these at least two...

A rectangle made of 12 teal-colored kites, four pink right triangles, and four blue diamonds in an arrangement that has both horizontal and vertical lines of symmetry.