The new look and destructive weapons of the silver spheres seems to be heavily inspired by a short story entitled "Second Variety" written by Philip K. Dick, who Don Coscarelli is a devoted fan. The story features a lethal type of small robots known as "claws", and described as "a churning sphere of blades and metal" that attack from ambush "spinning, creeping, shaking themselves up suddenly from the gray ash and darting towards any warm body".

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