Drawing of Roman lighthouse

Graphic representation of a tower-shaped building with twelve stages which get smaller as they ascend. In the first of these steps, at the bottom of the tower, there is a door, with arches. On five of the levels, there are steps. On the upper part, four curved lines opening outwards indicate beams of light. At the bottom of the building, a small vessel can be seen. The drawing was done with charcoal on the washbasin wall.