This work consists of seven brass discs of different diameters suspended from the ceiling at various heights. Each disc has a small opening in the centre, which at the beginning is closed with a plug. Coal dust is gradually poured onto each disc until the surface is totally covered by a cone of coal.
The discs are distributed in the space forming the constellation of the GREAT BEAR. All the plugs are taken out and the seven streams of coal form seven small cones on the ground, while the initial cones become craters.
The forms both on the discs and on the ground are the result of the inertia of the fall. The ground acts as a kind of mirror showing the silhouette of the Great Bear.