Eye of Sauron

In J.R. Tolkien's epic fantasy novel Lord of the Rings, Sauron is a disembodied evil entity that sees through the Eye of Sauron, which "sees all."  In Peter Jackson's film adaptation The Return of the King, the Eye appears as a searchlight-like fiery eye suspended between the twin horn-like spires above Sauron's fortress Barad-dr.