Maybe you've seen this short film. The first thing that made me smile was how willing Caine was to do his art regardless of how the world responded (it didn't). Caine didn't care. The goal wasn't to be accepted, the goal was to do it right. The second extraordinary thing is easy to miss. Around 3:30, you learn Caine's folk-arithmetic trick of using square roots to validate the PIN numbers on each fun pass. Extraordinary.