https://www.cnet.com/news/eye-of-sauron-watches-over-san-francisco-for-halloween/

Sauron is the titular villain of J.R.R. Tolkien's Lord of the Rings novels, and the Peter Jackson movie trilogy based on them depicted him as a burning eye on top of his dark tower in Mordor, searching for the lost One Ring.

Boston Properties and Hines, the companies that own of the tower and its LED installation, brought Mordor to the skies above Mission Street as part of San Francisco's "1 percent for art" development tax, according to SFGate.