Classicism, in the arts, refers generally to a high regard for a classical period, classical antiquity in the Western tradition, as setting standards for taste which the classicists seek to emulate. In its purest form, classicism is an aesthetic attitude dependent on principles based in the culture, art and literature of ancient Greece and Rome, with the emphasis on form, simplicity, proportion, clarity of structure, perfection and restrained emotion, as well as explicit appeal to the intellect. The art of classicism typically seeks to be formal and restrained: of the Discobolus Sir Kenneth Clark observed, "if we object to his restraint and compression we are simply objecting to the classicism of classic art. A violent emphasis or a sudden acceleration of rhythmic movement would have destroyed those qualities of balance and completeness through which it retained until the present century its position of authority in the restricted repertoire of visual images." Classicism, as Clark noted, implies a canon of widely accepted ideal forms, in the Western canon that he was examining in The Nude (1956).