Exhibition catalogue published in conjunction with show held January 8 - February 14, 1971, organized by Konrad Fischer and Gian Enzo Sperone. Includes artist's projects by Alighiero Boetti, Stanley Brouwn, Daniel Buren, Hanne Darboven, Jan Dibbets, Hamish Fulton, Giulio Paoline, Giuseppe Penone, Savlo. Terry Atkinson was unable to participate due to a British Mail postal strike.