In keeping with the Halloween spirit, here is Extra Credits
' spooky symbolism episode. It covers how symbolism is used in games to convey strong emotions, specifically dread, uneasiness and paranoia in survival horror games. Incidentally, if you haven't checked out Extra Credits, you should definitely take a look at their other videos. Daniel Floyd did a lot of good youtube videos about the philosophical and serious side of game development, and now he's doing them full time for the Escapist with fellow developers/enthusiasts Allison Theus and James Portnow. All of his/their work is worth a look.