A single 584-line poem structured as a circle; the opening lines repeat exactly as the closing lines, suggesting the Aztec calendar stone that gives it its name. Paz meditates on love, time, Mexican history, and erotic mysticism with a philosophical density that draws on Surrealism, Buddhism, and pre-Columbian cosmology simultaneously. Nobel Prize 1990. Paz was also the century's greatest critic of Mexican culture; Sunstone is where his poetry reached its summit.

The case for it, the case against, and the rest of the canon open with Pro.