Illusionism

Illusionism in art history means either the artistic tradition in which artists create a work of art that appears to share the physical space with the viewer or more broadly the attempt to represent physical appearances precisely – also called mimesis. The term realist may be used in this sense, but that also has rather different meanings in art, as it is also used to cover the choice of ordinary everyday subject-matter, and avoiding idealizing subjects. Illusionism encompasses a long history, from the deceptions of Zeuxis and Parrhasius to the works of muralist Richard Haas in the twentieth century, that includes trompe-l'oeil, anamorphosis, Op art, Abstract Illusionism, and Illusionistic ceiling painting techniques such as di sotto in sù and quadratura.Sculptural illusionism includes works, often painted, that appear real from a distance. Other forms, such as the illusionistic tradition in the theatre, and Samuel van Hoogstraten's "peepshow"-boxes from the seventeenth-century, combine illusionistic techniques and media.

The development of increasingly accurate representation of the visual appearances of things has a long history in art. It includes elements such as the accurate depiction of the anatomy of humans and beasts, of perspective and effects of distance, and of detailed effects of light and colour. The Art of the Upper Paleolithic in Europe achieved remarkably lifelike depictions of beasts, and Ancient Egyptian art developed conventions involving both stylization and idealization that nevertheless allowed very effective depictions to be produced very widely and consistently. Ancient Greek art is commonly recognised as having made great progress in the representation of anatomy, and has remained an influential model ever since. No original works on panels or walls by the great Greek painters survive, but from literary accounts, and the surviving corpus of derivative works (mostly Graeco-Roman works in mosaic) it is clear that illusionism was highly valued in painting. Pliny the Elder's famous story of birds pecking at grapes painted by Zeuxis in the 5th century BC may well be a legend, but indicates the aspiration of Greek painting. As well as accuracy in shape, light and colour, Roman paintings show an unscientific but effective knowledge of representing distant objects smaller than closer ones, and representing regular geometric forms such as the roof and walls of a room with perspective. This progress in illusionistic effects in no way meant a rejection of idealism; statues of Greek gods and heroes attempt to represent with accuracy idealized and beautiful forms, though other works, such as heads of the famously ugly Socrates, were allowed to fall below these ideal standards of beauty. Roman portraiture, when not under too much Greek influence, shows a greater commitment to a truthful depiction of its subjects.

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