It is the same for an evolutive pictorial work whose variations can be of different natures. They can be:
The theme undergoes modifications such that it is more or less recognizable in different intervals
The projection times of the visuals and their transitions are modified in order to make the work dynamic.
The tone and harmony of the colors corresponding to the theme are modified more or less sensitively.
These various modes of variation can be combined with each other, the initial theme then becoming