Why not the edge, then? In use, the edge delineates the first part of the blade to perform the actual function of the blade; since the function may be to cut or to puncture, the tip must be considered part of the edge. 
 
What is the beginning of a circle? 
 
For that matter, what is the sound of one hand clapping? Questions can appear simple; that doesn't necessarily imply that the answer will be equally simple. 
 
We monkeys do love a puzzle, even if we must fabricate them ourselves, for our amusement nd edification.
		 
		
		
		
		
		
		
		
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