Remark made during a week at Princeton beginning 9 May 1921, later carved above the fireplace of the Common Room of Fine Hall (the Mathematical Institute), Princeton University - in R. W. Clark Einstein (1973) ch. 14
"'You have naked bodies and genitalia, don't you? Why are you so adolescent?': Director Peter Greenaway on 'Puritan' Americans and the intense sex scenes in 'Eisenstein in Guanajuato'". Interview with Gary M. Kramer, www.salon.com. February 4, 2016.
"A New Model of the Universe: Principles of the Psychological Method in Its Application to Problems of Science, Religion and Art". Book by P.D. Ouspensky, 1931.