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In 2012, an American mathematician named Bill Gasarch offered a prize of $289 to anyone who could find a way to colour an arrangement of 17 x 17 squares in such a way that no square or rectangle within it had four corners in the same colour. The prize was collected by Bernd Steinbach and Christian Posthoff. Click here to read the announcement. They also found a solution for an 18 x 18 square.

17 x 17 = 289, hence the prize that was offered.

In 2019 Sameer Shah presented this square as one of his favourite pieces of maths in a (not very serious) competition to find The World’s Most Interesting Mathematician (2019).

This was my inspiration for making the wall-hanging.