"What is it that makes us human?" asks Dr. Schreber, "Will a man given the history of a killer continue in that vein? Or are we more than just the mere sum of our memories?" This is the question Dark City poses to us.
The narration explains to us that the Strangers came from another galaxy. They were dying. They seek to find the secret of the human heart, or soul, or whatever it is that falls outside their compass and thus they create a vast artificial city, which can be fabricated, or "tuned," and erase and alter memories whenever they want to run another experiment.
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