i have a shadow/light chaser, was locked in a cupboard for her first six months so learned to entertain herself this way, i have seen her make her nose sore banging it against a light on a wall, i have seen her fly across a room to get to a reflection from a window, on sunny days , all watches have to be worn facing in, her favourite place is under the van if tied out or under a chair, she is 8 now and a lot better than she was but still does it especially when stressed, is she OCD yes i would say so