Richard Long, Love Minus Zero/No Limit (detail), 2014, A two panel carborundum relief, left panel printed in a Black/Ultramarine Blue ink mix, right panel in a Vermilion/Ruby Madder/Primrose ink mix on Hahnemühle Etching White 350 gsm paper. Overall 121.5 x 388 cm, Edition of 2, Courtesy Richard Long and Alan Cristea Gallery, London