In the art of the Exposition the great underlying theme is that of achievement. The Exposition is being held to celebrate the building of the Panama Canal, and to exhibit to the world evidences of the progress of civilization in the decade since the last great exposition-a period among the richest in the history of civilization. So the ideas of victory, achievement, progress and aspiration are expressed again and again: in the architecture with its triumphal arches and aspiring towers; in the sculpture that brings East and West face to face, and that shows youth rising with the morning sun, eager and unafraid; and in the mural paintings that portray the march of civilization, and that tell the story of the latest and greatest of mankind's triumphs over nature. But perhaps the most significant thing of all is the wonderfully harmonious and unified effect of the whole, that testifies so splendidly to the perfect co-operation of American architects, sculptors and painters. The dominant note artistically is harmony. At no other exposition have the buildings seemed to "hold together" so well; and at no other has there been the same perfect unity of artistic impression. The Chicago Exposition of 1893 focused the artistic expression of the nation at that time. It brought about the first great awakening of the country in artistic matters, and it practically revolutionized American architecture. The St. Louis Exposition of 1904, while less unified in plan, gave another great stimulus to architecture, and especially to sculpture. But the Panama-Pacific Exposition should have a more far-reaching effect than either of these, because its great lesson is not in the field of any one art, but in showing forth the immense value of coordination of all the arts in the achievement of a single glorious ideal. The great thing here is the complete harmony of purpose, of design, and of color, in the combined work of architects, sculptors, painters, and landscape gardeners. The sensible plan that results in perfect convenience in getting about, the clothing of this plan in noble and fitting architectural forms, the use of sculpture and painting as an integral part of the architectural scheme, the tying in of buildings to site with appropriate planting, and the pulling together of the whole composition with harmonious color-these are the things that will leave their impress on American art for all time to come. If each student of the art of the Exposition takes home with him an understanding of the value of this synthesis, of this co-ordination of effort, he will have the key to the Exposition's most valuable heritage to the American people.