I made this but it was designed by a group of mathematicians in a workshop at a Mathematics Conference in 1998. The delegates were challenged to design a series of eight squares to fit particular criteria.

Each set of eight had to show some form of progression and every square had to be exactly half pink and half blue. Each square also had to have 20 stitches, if knitted in the conventional way, and 28 stitches on the diagonal, if knitted from corner to corner. These numbers ensured that the squares would all be the same size.