Originally Posted by
MSPeconomist
What about motion sensor activated lights is a room? Would a "perpetual motion" machine work, like the ball bearings going down a track or the balanced model of a bird bobbing for a drink? I've been thinking about either a coo coo clock or an electric train, but does anyone know whether such toys work?
If your motion machine approximates a person of 100 pounds or more, heated to human temperature, moving within the field of view, it might work.
I guess I move enough in my sleep not to have to worry about such things.