This work takes the form of a glazed metal box, filled with water, standing on a pedestal. An egg rolls around unpredictably inside it. Its movement is linked to that of a pendulum, which swings backwards and forwards with monotonous regularity. This relationship between two associated types of movement, that do not have the same rhythm – the one free, the other regular – arouses the visitor's curiosity. One wonders, among other things, which is the freer of the two: the egg with its changes that are random but governed by the pendulum, or the pendulum, which repeats it rhythmic rocking? The contrast is heightened by the fragility of the egg, the transparency of the water and glass, together with the density of the metal.