Struggles to escape form as a manifestation of various norms and constraints are as old as architecture itself. But the formless is also increasingly in the air today, explicitly as in discussions of the "formless" quality of the city, and implicitly in talk of atmospheric buildings, randomised structures, and the dematerialisation (or increased mediation) of architecture. No doubt part of its appeal lies in the fact that he formless is frequently found at the intersections between architecture and other fields, from art to ecology or engineering. Nevertheless, the formless has not yet been theorised rigorously in architecture. It seems to underpin a wide range of tendencies that have not yet been connected, or even explicitly acknowledged or identified. This book represents a first step toward this articulation. 107 illustrations