Form that gives Substance

Notice how the play of light on this beech tree lends a sense of depth and substance to this photograph. I took one immediately prior from the angle where the setting sun struck the tree directly. The trunk only conveys two dimensions: height and width and in the first photo that is the impression To achieve the illusion of the third dimension then there must be a play of light which gives form, such as curvature emphasized here as the shadow begins faintly at the tangent and increases around the circumference. This is Protect 2 from John Hedgecoe's Guide to Photography. Hedgecoe is quite famous and is known as the man who taught the world to make pictures. One of his works has sold 200 billion copies: the royal stamp
http://en.m.wikipedia.org/wiki/John_Hedgecoe