The reason I don’t use the diagonals much is because the diagonal is everything that is in between the horizontal and the vertical stated, whereas I’ve come to believe that in my work, the best way for me to represent everything in between is not to state it, to capture it by stating the two ends, and somehow imply everything in between. The diagonal insinuates itself, that’s another thing. It’s an insinuating form.

Sean Scully, interview with Ned Rifkin, in Ned Rifkin (ed.), Sean Scully: Twenty years 1976–1995, London: Thames & Hudson, 1995, pp. 57–80 (p. 72).