English: Natural-colour image of Tin Bider Crater. The desert surface appears in shades of tan, camel, beige, and brown. Sunlight leaves north-facing slopes in shadow. In fact, the angle of the Sun can play an optical illusion. The crater certainly looks as if it sits at a lower elevation than the surrounding land, but it doesn’t. The angle of sunlight is from the south, and Tin Bider actually rises above the land to the south, east, and west.