Thomas walked down the street, hands in his pockets, concentrating on the pavement ahead of him. A simple aluminum can lie still on its side waiting for Thomas. “Klack, klack, klack,” the can rolled down an alley. Thomas used his amusement to follow the can and silently approached again as if stalking his prey, “klack, klack, klack.” The can ricocheted off a piece of plywood protruding from the rubbish mounds along the side of the alley. This time, Thomas would have to make an effort and deviate...