Two light spots are projected onto the wall with moving heads, which continuously drop down with apparent gravity and bounce back up again.
This light installation is formally reminiscent of the phenomenon of beta movement, a basic phenomenon for the cinematic perception of movement from a sequence of individual images.
In the simplest case, this apparent movement can be shown by two alternating light spots, but here it is generated by real light movements.
Thereby the simulation of physical phenomena such as gravity and elastic impact with light raises the question of whether light has any weight at all.