|Trompe l'oeil...trick of the eye.|
The mark of a good trompe l'oeil was one that fooled animals. For example, birds have tried to land in a courtyard that was actually an illusion.
Three dimensional trompes l'oeil, such as the ones designed and built by Gerard, have the advantage of incorporating foreground materials, stones and plantings flawlessly into the illusion.
Another allure of a trompe l'oeil is experiencing the bi-play between the brain and the senses, trying to interpret the data they are confronted with!
More information on this rather interesting concept is available from: