Life in buildings is supported by pipes. Ducts, conduits, water mains, and cables support biological and social life in spaces that are today held together by air-conditioning, electricity, and telecommunications as much as by form and materials. But while pipes and the machines they connect are part of buildings, they are often left out of architecture. This issue of Volume presents C-lab’s research and includes contributions by Mark Wigley, Kiel Moe, David Gissen, Andrès Jaque, MOS, and more.