The forms or objects that we are drawing onto that flat surface actually, in real life, have depth and dimension. As we view them and place their shapes and forms onto our drawing surface, we must always try to represent that depth so as to make the objects appear real and true. these forms must appear to extend deeply into the illusional space of our picture in order to create the only true magic in drawing and painting - the appearance of from, depth, and the natural play of light - all on a flat surface.