M.C. Escher was a famous Dutch graphic artist who is known for his work in which mathematics, illusion, and repetition are used to create mind-boggling art that inspires wonder. Escher's famous piece, Print Gallery, famously has a white circle in the centre where Escher placed his signature. Starting in 2000 after a random encounter with this piece of art while on an airplane, Professor Hendrik Lenstra, a professor both in Leiden and at the University of California, examined this image and used