How could a pain follow a pleasure if a thousand tiny pains or, rather, half-pains were not already dispersed in pleasure, which will then be united in conscious pain? However abruptly I may flog my dog who eats his meal, the animal will have experienced the minute perceptions of my stealthy arrival on tiptoes, my hostile odor, and my lifting of the rod that subtend the conversion of pleasure into pain. .... Tiny perceptions are as much the passage from one perception to another as they are components of each perception. They constitute the animal or animated state par excellence: disquiet. These are the "pricklings", or little foldings that are no less present in pleasure than in pain. The pricklings are the representative of the world in the closed monad.  
  Gilles Deleuze The Fold. Leibniz and the Baroque 1993, 86-87