There are Christmas trees with flashing lights, and then there are PEOPLE with flashing lights–in their navels. These adornments are called “belly lights” and they’re the creation of St. Charles inventor Gary Kellmann. He says he’s sold more than half a million of these red and green-colored lights since putting them on the market. Most have been sold to teen girls. The lights are the size of a chap-stick cap and operate on two hearing aid-sized batteries.