Not a very common word, but I remember from uni that it has something to do with a decline into disorderliness and derangement of predictability. Neither nor both are desirable in my work where there is a structured approach and the element of surprise that often makes a shoot so memorable (and often, memorable for all the wrong reasons). Entropy is also an active clinical characteristic in people with Alzheimers. This should be interesting. Sorry, what was the question??