Murals & Trompe l'oeil
Trompe-l'œil, French for "trick the eye" from tromper - to deceive and l'œil - the eye; is an art technique involving extremely realistic imagery in order to create the optical illusion that the depicted objects really exist.
Although the phrase has its origin in the Baroque period, use of trompe-l'œil dates back much further. It was (and is) often employed in murals, and instances from Greek and Roman times are known, for instance from Pompeii. A typical trompe-l'œil mural might depict a window, door or hallway to optically enlarge a room.
With the superior understanding of perspective drawing achieved in the Renaissance, painters often added trompe-l'œil features to their paintings, playfully exploring the boundary between image and reality. For example, a fly might appear to be sitting on the painting's frame, a curtain might appear to partly conceal the painting, a piece of paper might appear to be attached to a board, or a person might appear to be climbing out of the painting altogether.
