At first, Greek artists represented the young male figure naked, standing straight, as in the case of archaic kouros statues (650—480 BC). It was a revolutionary innovation when sculptures began to exhibit movement in the early fifth century BC (see, for instance, the Kritios kouros in Room II). In these works of art, the body is not divided into two equal halves anymore. The weight rests on one leg, while the other, free leg is bent and steps forward. The represented gestures affect how each body part is depicted: the free representation of movement has begun. One of the greatest masters of Classical period sculpture was Polykleitos. His works chiefly focus on a single artistic problem: the most perfect representation of the young male figure shown in dynamic movement. He even composed a theoretic work about the question, entitled Canon. His statues continued to serve as models in the later centuries of antiquity, and were often used as inspirations. In European culture, his work still exerts a definitive influence on the representation of the ideal male beauty.