Sentence:  The area adjacent to one edge of a piece of affixed material - or simply of a painted in form - will be shaded to <WSD>pry</WSD> 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:  to move or force, especially in an effort to get something open