Its said to be the worlds largest art exhibit, 110 kilometres and 94 stations which are decorated by some 200 artists. Welcome to an 1000-pieces art tour in the Stockholms subway system. Motif: Solna Centrum Station A spruce forest runs for almost 1000 meters along the walls, underneath a blood-red sky representing the depopulation of the sparsely populated area and the environmental degradation of nature. If you have enough time and patience, crack on this 1000 pieces puzzle. When you finish, you can frame it and turn it into a very stylish wall decoration. Photographed by David Altrath