In his classic book, PRAGMATISM, William James tells a story about a squirrel. Or, maybe it is about something else. You decide. He asks us to consider an argument among camping buddies in the Berkshires. It seems that a squirrel had gotten itself positioned on the trunk of a tree so that the tree was in between its own body and the body of one of the campers, on the other side. The camper, wanting to catch sight of the squirrel, started walking around the tree. The squirrel (randomly so far as we can tell, not out of anti-observer animus) moved around the tree to which it clung, in such a way as to keep itself on the opposite side from the man. When they had each travelled in this way 360 degrees around the tree, an intriguing question arose. Had the man at this point gone round the squirrel? James noted that the man had gone round the tree, and the squirrel had stayed on the tree. This was enough for some of the disputants -- he had gone roun...