The title echoes Rembrandt’s self portrait as an old man. What is Gray trying to capture here? Is it recording a likeness at a particular stage of life? This is a double portrait, illustrating him drawing himself. Perhaps it represents his need to keep on making work and the desire to never finish. (http://www.bbc.co.uk/programmes/articles/43Chdsg7qTVLdSmbGsHl7wz/alasdair-gray-at-80-seven-artworks)