The analysis of a work of art resolves it into these elements. There is first of all the emotion which gives birth to the work and which the work is designed to express. The emotion, to become definite, gathers about an idea, conceived in the terms of its own medium, as form, or color and mass, or musical relations; and this artistic idea presents itself as the subject or motive of the work. The emotion and artistic idea, in order that they may be expressed and become communicable, embody themselves in material, as the marble of a statue, the pigment of a picture, the audible tones of a musical composition. This material form has the power to satisfy the mind and delight the senses. Through the channel of the senses and the mind the work reaches the feelings; and the aesthetic experience is complete. As art springs out of emotion, so it is to be received as emotion; and a work to be appreciated in its true spirit must be enjoyed. But to be completely enjoyed it must be understood. We must know what the artist was trying to express, and we must be able to read his language; then we are prepared to take delight in the form and to respond to the emotion. To help us to understand a work of art in all the components that entered into the making of it is the function of historical study. Such study enables us to see the work from the artist's own point of view. A knowledge of its background, the conditions in which the artist wrought and his own attitude toward life, is the clue to his ideal; and by an understanding of the language it was possible for him to employ, we can measure the degree of expressiveness he was able to achieve. This study of the artist's purpose and of his methods is an exercise in explanation. The interpretation of art, for which we look to criticism, deals with the picture, the statue, the book, specifically in its relation to the appreciator. What is the special nature of the experience which the work communicates to us in terms of feeling? In so far as the medium itself is a source of pleasure, by what qualities of form has the work realized the conditions of beauty proper to it, delighting thus the senses and satisfying the mind? These are the questions which the critic, interpreting the work through the medium of his own temperament, seeks to answer.