Tom Learner, GCI senior scientist, (right) and Andrew Perchuk, GRI deputy director (left) in conversation with artist Craig Kauffman about the materials and methods used to create his work. Art: Craig Kauffman, Untitled Wall Relief, 1967/2008. Acrylic lacquer on vacuum formed plastic. 52 x 72 x 15 inches. © Estate of Craig Kauffman. Photo: Catherine Taft, GRI