Repetition - The use of the same visual element (usually a shape) multiple times. Repetition does not by definition indicate that there is any organization of the repeated elements -- at one extreme, the elements could be seemingly random in position; at the other extreme, the elements could be arranged in a very strict grid.
Repetition of elliptical shapes
Repetition of organic shapes
Still Life with Compotier
Repetition of elliptical shapes with variations in size