Sentence:  The area adjacent to one edge of a piece of affixed <WSD>material</WSD> - or simply of a painted in form - will be shaded to pry that edge away from the surface , while something will be drawn , painted or even pasted over another part of the same shape to drive it back into depth . 
Meaning of the word marked with <WSD> tags:  artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers