More than a simple collection of ephemera, Helfand's book is as generous as it is specific. Her thesis is that the simple form of the circle - or two joined circles (a "wheel") - literally turns all it touches. Unlike boxy, "windows" environments, circular logic spirals and spins out into webs and whorls, mapping and envisioning the world itself. Her introductory essay deals with moveable circular diagrams before the turn-of-the-century, specifically in astronomy, mathematics, and navigation. A gorgeous color plates section shows over 100 twentieth-century wheels at work. Her final thesis turns to the nature of the wheel in modern art, music, philosophy, and design. Aimed at a wide array of readers, Helfand manages to find a voice for them all: "Reinventing the Wheel" will be a welcome and unusual addition to bookshelves of designers, collectors, and the curious alike.