Lightness of touch … Felix Gonzalez-Torres’s “Untitled” (Wawannaisa), 1991. Photograph: The Felix Gonzalez-Torres Courtesy of Andrea Rosen Gallery, New York

“Untitled” (Last Letter). Photograph: The Felix Gonzalez-Torres Foundation Courtesy of Andrea Rosen Gallery, New York

Felix Gonzalez-Torres to Carl George, 1988