A zograscopio is an optical device to enhance the sense of depth perception obtained from a flat image. It is a lens through which images generally prepared for the apparatus are. Some models have the lens mounted in a holder in front of a mirror at an angle, allowing to look through the lens to the image plane located on a table while sitting. The images seen in this way must be reversed from left to right; This is obvious in the case of writing. It made an impression for this purpose it was originally called in French vue d'optique (perspective view in Spanish). According Michael Quinion, the origin of the term has been lost, but the apparatus is also known as diagonal mirror as optical machine support, or optical machine diagonal.1