..these reproductions were in Zwemmer's bookshop [in the 1920's]. I can see them now. They were black. There was one on Negro sculpture, one on Mexican sculpture, one on an Egyptian sculpture, and so on. And all these I knew. And in one of them was this small reproduction of the Chac Mool [famous Toltec-Maya sculpture]. It was the pose that struck me – this idea of a figure being on its back and turned upwards to the sky instead of lying on its side, which is a different sort of idea from the Renaissance, or Greek reclining figure, which is usually on its side. And this gave me all sorts of chances of making variations on it.