After about two hours of reading or discussion, we would go for a walk and then have tea at Lyons, or in the restaurant above the Regal cinema. Sometimes he came to my house in Searle street for supper. Once after supper, Wittgenstein, my wife and I went for a walk on Midsummer Common. We talked about the movements of the bodies of the solar system. It occurred to Wittgenstein that the three of us should represent the movements of the sun, earth, and moon, relative to one another. My wife was the sun and maintained a steady pace across the meadow; I was the earth and circled her at a trot. Wittgenstein took the most strenuous part of all, the moon, and ran around me while I circled my wife. Wittgenstein entered into this game with great enthusiasm and seriousness, shouting instructions at us as he ran. He became quite breathless and dizzy with exhaustion.
– Norman Malcolm
Ludwig Wittgenstein: a Memoir