Museums and galleries offer one way to look at art. When a painting is taken off the wall and subjected to high-tech scrutiny, an entirely different view of it becomes possible. This program demonstrates the ability of laboratory researchers to venture beneath the finished surface of paintings, shedding light on previously hidden versions and designs. Techniques that use X-rays, ultraviolet radiation, and infrared light are examined, illustrating cases in which the original goals of an artist—as well as subsequent restoration, misguided revision, or even blatant attacks on a work—become apparent. (27 minutes)