Reminiscent of Michael Crichton's 'Sphere'
I know Sphere wasn't the first movie to use this idea either, that's not what I'm saying. It's just cool to see a film reminiscent of Crichton's novel where people in a research facility are besieged by monsters which turn out to be generated by their imagination.
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"Pride is not the opposite of shame, but its source. True humility is the antidote to shame."