Book excerpt: This monograph brings together works by the two artists, not only shedding light on the richness of their individual practices, but also offering an opportunity to clearly see some shared interests and how much these artists actually had to say to each other. Contributions by Sarah Hamill and Elizabeth Hutton Turner inform about these artists' paths and their encounters and collaboration with photographer Ugo Mulas. Hamill looks closely at the many photographs Mulas took of Calder' and Smith's sculpture at the 1962 Festival of the Two Worlds, in Spoleto. Turner explores how and why Calder and Smith found common ground in their shared identification with the American culture of invention. Exhibition: Hauser & Wirth, Zurich, Switzerland (12.06.-16.09.2017).