Five short sequences, each of about 8 frames, all recorded from the same point of view in a cafe on the dock. We are shown a window, broken by the silhouettes of objects and people inside the cafe and by the passage of people and a boat on the outside. Each shot, in which short movements are seen, is repeated 21 times in the film, in a mathematically established order. The shots are separated by short, equal sequences of black spacing. The importance does not lie in the mathematical sequences as such, but in how the viewer attempts to decipher the structure.