materials of contemporary architecture. A kind of “liquid stone” at the outset, it is malleable, durable, and capable of prodigious feats of engineering. This Bibliotheca Universalis edition highlights the best work done in concrete of recent years. It includes such stars as Zaha Hadid, Herzog & de Meuron, and Steven Holl, but also surprising new architects like the Russians SPEECH and artists such as James Turrell, who turned the famous concrete spiral of Frank Lloyd Wright’s Guggenheim in New York into the setting of one of his most remarkable pieces.