The easel picture, the favored form of painting in the United States, is a symbol not only of the American artist’s independence of expression and freedom of enterprise but also of his dependence upon his own resources and private patronage. Easily transported, it is adaptable for exhibit in distant galleries, for sale to successive owners, and is more easily reproduced. In the 19th century it was largely the means of living for the professional fine artist. George Catlin found admission charges to his exhibits remunerative. Others turned to engravings of their subjects for profit. In the 20th century the framed picture has become the delight of the amateur. American enjoyment of freedom of thought and action is lived in the solitude of private studios. Yet too rarely do these common privileges and fortunate blessings become the subject matter of the canvases. These canvases exist solely for the enjoyment of the individual. Mural painting, however, in comparison to easel picture painting, is made for the edification of large numbers of people and demands the formal presentation of themes affecting all. The work of Brumidi, though in a foreign style long past the crest of its vigor in service to the Church, was found more suited to the requirements of monumental architecture than that of native painters of the middle of the 19th century. The monumental mural is usually better if executed in fresco, the medium which Brumidi used. This process of painting directly on the wall is called “fresco secco” if the wall is allowed to harden and become almost dry and the pigment bound to it by means of a glue size, casein or egg yolk. This is much inferior to the true or “buono fresco” employed by Brumidi in the dome which is painting on freshly laid plaster with pigment suspended in pure water. Because the mortar sets in six or eight hours the painting must be done in sections no larger than can be completed at one time. In true fresco a finished study is generally required. Frequently this assumes the form of a full-size detailed drawing known as a cartoon. The outline of this is transferred to the damp plaster wall by pouncing dry color through a perforated tracing or “pattern,” or the cartoon on very light tough paper may be held against the surface and contours pressed into the damp wall with a stylus. Figures are modeled within the drawn lines. Terre verte is employed in underpainting flesh, the rosier tones being superimposed later. Accessories are painted in washes of varying depths and appropriate colors further deepened or lightened until the desired three-dimensional effect is gained. In the Sistine Chapel, Michelangelo used color glazes with such economy that the panels and single figures of his great ceiling decorations truly appear as water color paintings. Brumidi depended upon a heavier use of pigment and built up his lights opaquely.