All the way back to the cave paintings and the invention of the first stone tools, what moved men to create was an everyday impulse. But it was an impulse in the everyday of men, not of animals. Whether we search for the beginnings of creativity either in art or in science, we have to go to those faculties which are human and not animal faculties. Something happens on the tree of evolution between the big apes and ourselves which is bound up with the development of personality; and once our branch has sprung out, a painter like Santi Raphael and a chemist like Humphry Davy both lie furled in the human beginning like the leaves in the bud. What the painter and the inventor were doing, right back in the cave, was unfolding the gift of intelligent action.