 This method is most often taught in conjunction with advanced compositional theory.Since it is not necessary to copy the subject accurately to achieve a successful illusion, this method allows the artist to experiment with many options while retaining what appears to be a realistic image.In one example, the "Study of a male figure, for Mercury descending" (c. 1613–1614 (drawn), in "The Education of Marie de' Medici"), Rubens has obscured the point where the legs attach to the torso.