If one examines the reason why certain works of art offend us, one is likely to find that the cause is that there is no personally felt emotion guiding the selecting the assembling of the materials presented. We derive the impression that the artist, say the author of a novel, is trying to regulate by conscious intent the nature of the emotion aroused. We are irritated by a feeling that he is manipulating materials to secure an effect decided upon in advance. The facets of the work, the variety so indispensable to it, are held together by some external force. The movement of the parts and the conclusion disclose no logical necessity. The author, not the subject matter, is the arbiter.