Thus, you see, with what simple clearness Raphael grasped the idea that Pope Julian II asked him to commemorate. It is as logical as a proposition in geometry, and on simple principles of geometric design he built up the idea into a picture. How the simplicity of the idea has been elaborated with a variety of beautiful thoughts, and how the simplicity of the design of the structure has been hung, as it were, with rich embroideries of detail, I must leave you to search out for yourselves. If you do, you will find that each figure represents some example of repetition or contrast, each a separate beauty and meaning.