People get nervous when they don't know why you're taking a picture of something. Pointing a camera at the Statute of Liberty is understandable. Taking a photo of a barge or some pilings in the East River attracts authorities. This anxiety is not just a feature of cities. Speeding through Utah one evening, I saw the beautiful skeleton of a wrecked cement mixer on the horizon, backlit by the sun setting beneath the blank Salt Flats. I pulled onto the shoulder of the empty highway with my camera ready to flash. Two minutes later, a man in sunglasses in a black jeep with tinted windows was hollering at me, demanding my camera.