  We consider a deposition model in which balls rain down at random towards a
2-dimensional surface, roll downwards over existing adsorbed balls, are
adsorbed if they reach the surface, and discarded if not. We prove a spatial
law of large numbers and central limit theorem for the ultimate number of balls
adsorbed onto a large toroidal surface, and also for the number of balls
adsorbed on the restriction to a large region of an infinite surface.
