Ernő Rubik, a Hungarian architect and professor, invented his cube in Budapest as a teaching tool to help students understand three-dimensional geometry. He didn’t realise it would become one of the best-selling puzzles of all time. Budapest still hosts the Rubik’s Cube World Championship and several museums are dedicated to the cube’s history. In the school where Pete teaches English, children are eager to tell you how quickly they can complete the puzzle.

Fun fact: It took Rubik over a month to solve his own creation after realising that the cube’s mechanism allowed for complex combinations he hadn’t foreseen.