Geometrical proofs on the door , by giovanni battista piranesi , design , Neoclassicism style , instruments and mechanisms, Room
A drawing of a building and a drawing of the inside of the building.
A black and white drawing is on a white paper. There are three pictures on the paper. The first picture is of a building. The second picture is a drawing of a wall with a large circle on it. There is writing on the bottom of the picture. 