GR translation: which speak the reverse of its own cohesion

[Mike Jing]

P67.1-2  In its blunt, reluctant touches along the wall (which speak the reverse of its own cohesion) he can, ...

I figure the "which" refers to "touches", and "its own cohesion" of course is the shit's own cohesion.  But what does "speak the reverse of its own cohesion" mean exactly?  Does it mean that its own cohesion is strong, unlike its "reluctant" touches along the wall?

 		 	   		  
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