...(this is also true of primary structures like the diagonal, which are ideas beFig. 5. Andy Warhol, Brillo Soap Pads Box, 1964, silkscreen ink and house paint on plywood, 17 x 17 x 14 in. (43.2 x 43.2 x 35.6 cm). Founding Collection, The Andy Warhol Museum, Pittsburgh. Fig. 6. Donald Judd,...