The Tunnel series consists of 4 images. Each of the 4 images consists of 6 acrylic panels 430 mm wide, 570 mm high and 2 mm thick. Three panels are arranged one behind the other at a distance of 18 mm; the two stacks of three are then arranged side by side. This results in the following dimensions for the images: 860 mm wide, 570 mm high and 42 mm deep. Photos of a railroad tunnel served as a source.