1954, the famous mathematical physicist Peng Roth listened to an artist M C? Escher's speech. This speech inspired him to rediscover the impossible trinity. At that time, Penrose was not familiar with the previous research on the impossible trinity by scientists such as Reutersvard and piranesi. So, he constructed the optical illusion in the most familiar form at present. From 65438 to 0978, he and his father Lionel published his findings in the British Journal of Psychology. 196 1 year, Woodward sent a copy of this paper to escher, and escher incorporated this effect into his most famous lithograph painting Waterfall.