Looking at his extensive library one day, Roderick Vos realized that a scattering of small lights would showcase the books and aid readers. So he designed Mr. Ed, a light bulb held in place by two vertical, book-like shapes. At home on a bookshelf or on a bedside table, Mr. Ed has enough brute strength to act as a bookend. Although Mr. Ed can use any 40-watt bulb, Vos prefers an incandescent bulb for its warm glow. In fact, Vos named Mr. Ed after the inventor of the incandescent, Thomas Alva Edison.