Richard Long, Africa Dub, 2014, A two panel carborundum relief printed in Burnt Umber/Raw Umber/Lemon Yellow/Orient Blue ink mix on Moulin Du Gue 350 gsm paper, left panel painted in Carbon Black/Cobalt blue mix acrylic wash, right panel in a Graphite Grey/Paynes Grey/Zinc White mix acrylic wash. Overall 239.5 x 233 cm, Edition of 5, Courtesy Richard Long and Alan Cristea Gallery, London