The Cubists tried to get away from one-point perspective which dominated Western painting since the Renaissance. Basically, one-point perspective freezes the scene into a photographic image. It works like the eye of a camera - one eye only. Cézanne tried to paint with both eyes open simultaneously. Therefore his contours looks blurred in close-up. However, they read well over greater distance. The Cubists - Picasso and Braque - tried to use several viewpoints and consequently had to break up the objects they painted. the phase of Analytical Cubism shows how they tried to come to grips with the problem of depicting an object from several viewpoints at once - in order to allow a more comprehensive, time-based view of what they saw. They used angular lines to separate the different viewpoints - you could also see those as different "moments" seen after one another - from each other. Piet Mondrian misunterstood Analytical Cubism and concentrated on the grid of angular lines, dispensing with the object altogether. Picasso never did that. Out of Analytical Cubism, he developed Synthetic Cubism, where he introduced movement into his depictions. Some people misunderstood the figures he painted as distorted. In fact, they should be read as moving on the picture plane (his faces do not have three eyes, for instance, but two eyes, one of which is seen twice).