 This allows the artist to choose from a great number of very different alternatives, making his selection based on personal preference or aesthetics rather than accuracy.In the referenced exercise it is possible to experiment with numerous manipulations regarding the size and placement of each part of the body while at the same time using a collection of two-dimensional foreshortening illusions to retain the appearance of realism.In addition to body parts, artists may rely on the manipulation of many other elements to achieve a successful illusion.