The Addition Chromatique is based on the irradiation of color, that is, on the evidence that showed that when two color planes touch each other, a virtual line appears that is darker than the contact zone, Cruz-Diez generated what were named Chromatic Event Modules that, to some extend, were the cause of the continuous transformation of color. 
 
It is a critical space generated between two planes of color that when they touch, generate another color that does not exist on the support.