Four differently-colored light bulbs are lit by switching correspondingly colored switches. Yet when the bulbs are moved to different sockets, the corresponding switch still lights the bulb of the same color. Then the switch covers are mixed around and still the corresponding switch and bulb light as before. Includes instructions and a custom box. This is not the Wellington version, but a version by another maker, and the method relies on gimmicked bulbs which, once burt out, must be replaced by other gimmicked bulbs that are no longer available. And yet, this version of the trick does not rely on special electronics. Sold as a display item only and not guaranteed to keep working; as-is condition. Currently in good working condition.