The worlds of Vasarely are many, reflecting the diversity of visual experiences that inspire them. Their common denominator is that they all take observation as their starting point. Only scale varies: for Vasarely, abstraction is simply the consequence of adjusting perception to different levels of reality. In 1945, he created a series of collages using shapes cut out from microphotographs. Here in lies one of the keys to his approach to abstraction—it is less a matter of breaking the ties with nature than of seeking out new forms from deep within what he called nature’s "internal geometry." In this way, the world of cells and crystals opened up to him.