<P> A more refined art of figure drawing relies upon the artist possessing a deep understanding of anatomy and the human proportions . A trained artist is familiar with the skeleton structure, joint location, muscle placement, tendon movement, and how the different parts work together during movement . This allows the artist to render more natural poses that do not appear artificially stiff . The artist is also familiar with how the proportions vary depending on the age of the subject, particularly when drawing a portrait . </P> <P> Linear perspective is a method of portraying objects on a flat surface so that the dimensions shrink with distance . Each set of parallel, straight edges of any object, whether a building or a table, follows lines that eventually converge at a vanishing point . Typically this convergence point is somewhere along the horizon, as buildings are built level with the flat surface . When multiple structures are aligned with each other, such as buildings along a street, the horizontal tops and bottoms of the structures typically converge at a vanishing point . </P> <P> When both the fronts and sides of a building are drawn, then the parallel lines forming a side converge at a second point along the horizon (which may be off the drawing paper .) This is a two - point perspective . Converging the vertical lines to a third point above or below the horizon then produces a three - point perspective . </P> <P> Depth can also be portrayed by several techniques in addition to the perspective approach above . Objects of similar size should appear ever smaller the further they are from the viewer . Thus the back wheel of a cart appears slightly smaller than the front wheel . Depth can be portrayed through the use of texture . As the texture of an object gets further away it becomes more compressed and busy, taking on an entirely different character than if it was close . Depth can also be portrayed by reducing the contrast in more distant objects, and by making their colors less saturated . This reproduces the effect of atmospheric haze, and cause the eye to focus primarily on objects drawn in the foreground . </P>

Which is not an example of a dry medium used for drawing