Sauron is the Dark Lord of J.R.R. Tolkien's The Lord of the Rings, and his great burning Eye, set atop the tower of Barad-dûr, became one of the most recognisable symbols of the Peter Jackson film trilogy released between 2001 and 2003. The Eye represents constant surveillance and corrupting power, watching Middle-earth for the One Ring. Online, the sound associated with it is reused far beyond Tolkien fandom, appearing in edits, reaction videos and memes whenever a creator wants to suggest that something powerful, sinister or all-seeing has just turned its attention to them.