The recursion has a visual impact: the development of the construction in the plan becomes at once perceptible. A rhythm results simply from variations more or less marked with color and with size of elements, contrasring with the rigidity of structure of every element.

We investigated the effects of various types of variations of elements: either by stressing the contrasts between elements, what leads to more geometrical images, or by going to the other sense, until shade off completely the separation between elements, what produces more disintegrated images, éventuellemnt richer in variations of color.