lk about are often quite 
different from the classifications that philosophers, no matter how 
insightful they are, tend to get all persnickety about, so that there 
is always going to be a mismatch betweeen any a priori high-level 
categorisation heirarchy and the actual things that are going to have 
to find a place on it. This mismatch has two dimensions, in fact: the 
philosophers make distinctions which the engineers don't need (like 
continuant/occurrent), and the engineers, biologists, etc. come up 
