“At twilight on Monday, something new will light up a Times Square billboard. An original work of art, 23 stories high, will replace a bright yellow ad for Sprint. The artist whose work now gets a canvas Rembrandt could never have imagined is a substitute teacher from Allentown, Pa., who has made art for over 30 years but never had the backing of a major museum or gallery. Her creation will loom over Times Square because she won an online contest in which users of a Web site gave her more votes than 35,000 competitors.”