Duality in The Shining
www.drummerman.net/shining/duality.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
The concept of doubles has always had a hold on the collective imagination of mankind. The good twin/evil twin scenario, Jekyll and Hyde, Doppelgangers - there's something inherently disturbing and fascinating about the idea that there can be duplicates of something, or that one thing can be two conflicting entities at once.