Any change of visual perception made by an artist, it alters what is normally regarded as realistic. Often affected are size, position, or general character. Distortion is a term also used for any degree of personal or subjective interpretation of natural forms. Artists throughout history have consciously used Distortian including Gothic sculptors and painters,Mannerists such as El Greco; and Cubists, Surrealists and Expressionists including Pablo Picasso, Max Ernst and Vincent Van Gogh. Source: Ralph Mayer, "A Dictionary of Art Terms and Techniques"