Rama is a hollow cylindrical spacecraft invented by A.C. Clarke in his novel "Rendez vous with Rama". Its internal diameter is 16 km, and its external length is 50 km. Rama spins around its axis and is lit by six 10 km long linear light sources on its surface, 120° apart from each other. The figure below shows a schematic view of Rama, which can be divided in 5 zones: the south pole, the south plain, the cylindrical sea, the north plain and the north pole.
Some Computer Generated Imagery freely inspired from this spacecraft: