Gordon House, E. Quoined Chase, 1970, etching and aquatint on paper, 377 x 378 mm, Tate.
House (pop-cultural claim to fame: designed the back cover of Sgt. Pepper) fills a square elegantly with some op-art shimmer. You get an illusion of depth if you look at it for long enough, so that's good. Part of a wider series in which similar squares are filled in a range of groovy sixties ways. Essentially art as interior design (as in the arrangement of enclosed space), which is appropriate considering his surname. House, get it? Oh, never mind.