Searching for "movies" in forums leading to no results, so starting this thread.
What are some movies reminiscent of Westworld?
Two big ones come to mind for me (theme: alternate/virtual reality gaming and the nature of reality), and I HIGHLY recommend watching them ASAP, in this order:
1) The Thirteenth Floor: http://www.imdb.com/title/tt0139809/?ref_=fn_al_tt_8
2) The Nines: http://www.imdb.com/title/tt0810988/
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4) Uncanny Valley. Short movie, you can watch it here:
5) Source Code
6) A few years ago, there was a Swedish TV serie called "Real Humans". From Wikipedia: "The series follows the resulting emotional effects on two families as well as the trials of a group of robots who have attained free will and want their freedom from human ownership"
I would also say
AI (Artifical Intelligence)
Aliens Quadrillogy/Prometheus (not specifically but because of involvement of AI bots)
If you are talking VR type:
Also, if you are looking for AR type movie you may want to be on the lookout for Ready Player One. The book is one I really enjoyed.
But you said a "nature of reality" theme.
So, in that vein, I would nominate "Cloud Atlas".