The third edition of the Aspen Art Museum's periodical "Permanent Collection" on the theme of happiness. Includes a conversation between Heidi Zuckerman and Richard Tuttle; essays by Agnes Martin, Pier Paolo Calzolari and Dave McKenzie; visual essay by Fischli & Weiss; conceptual instructions by Agnes Martin; and a correspondence between Gedi Sibony and Heidi Zuckerman. Illustrated throughout.