“Primarily understood as works produced by artists who lack formal training, although trained artists may deliberately affect a naive style. The term most clearly describes such early-20th-century artists as the Douanier Rousseau, whose childlike, non-naturalistic paintings completed in bright colors influenced early modern artists. Their apparent affinity with non-Western art and their bold expressiveness made them appealing to the early Modernists searching for new forms of expression.
See ‘Outsider’ art.”
Excerpted from: Diamond, David G. The Bulfinch Pocket Dictionary of Art Terms. Boston: Little Brown, 1992.