Scanography is a photography technique that uses a scanner like a digital camera to take images. Unlike photos from a camera, scanography images have a shallow depth of field, with only the part of an object touching the glass being in focus. This gives scanned 3D objects a soft effect. High speed photography involves either taking photos fast enough to freeze high-speed motion, or capturing successive frames at a high rate. This allows recording events too fast for the naked eye. Light writing is a form of stop motion animation created by moving a light source in long exposures to illuminate parts of the scene over time, giving the illusion of drawing or painting with light.