The present volume offers eloquent testimony that many of the master builders of this century have held passionate convictions regarding the philosophic and social basis of their art. Nearly every important development in the modern architectural movement began with the proclamation of these convictions in the form of a program or manifesto. The most influential of these are collected here in chronological order from 1903 to 1963. Taken together, they constitute a subjective history of modern architecture; compared with one another, their great diversity of style reveals in many cases the basic differences of attitude and temperament that produced a corresponding divergence in architectural style. In point of view, the book covers the aesthetic spectrum from right to left; from programs that rigidly generate designs down to the smallest detail to revolutionary manifestoes that call for anarchy in building form and town plan.