A little girl on the beach plays with the power to attract and repel the waves. Her gestures synchronize with the back-and-forth movement of a pendulum, which in turn harmonizes with the sound of the ebb and the surf. The synchronization of the child's movement, that of nature (the sea) and that of the watchmaker's device (the pendulum) clearly demonstrates the causal links between them to serve an idea of temporal decomposition. But what exactly are these links? Or which of these three symbols is the most objective, humanly speaking, of the invention of time? I'm leaning towards the little girl, who, in her game of omnipotence, wants to be the organizer of all this imbalance. Beyond Newton's law, gravity or fluid mechanics, it's the unfolding of childhood and its games that make us aware of the advance of time.