My Heart, Brief as Photos

Perhaps this capacity is linked to the fact that all young animals need to play in order to learn. Between play and gratuitous pleasure there is a face in common. Playing implies a distinction between the real and the playful. The world is doubled by play. There is the involuntary world of necessity and the voluntary world of play. In the second world pleasure no longer serves a purpose but becomes gratuitous.
—John Berger, And Our Faces, My Heart, Brief as Photos