Mel Bochner, "Primer (Twenty-One Demonstrations from A Theory of Sculpture [1969-1972])," 1995, portfolio of 21 screenprints (white ink on black paper), within publisher's wooden box, each 9 7/8 x 6 7/8 inches (25.1 x 17.5 cm). Published by Gallery 360, Tokyo, Japan. © 2012 Mel Bochner