Steinhaus, with his predilection for metaphors, used to quote a Polish proverb, "Forturny kolem sie tocza " (Luck runs in circles), to explain why pi, so intimately connected with circles, keeps cropping up in probability theory and statistics, the two disciplines which deal with randomness and luck.

Enigmas of Chance: An Autobiography, The Search for the Meaning of Independence (p. 55)