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"The SF approach: an awareness that things could have been different, that this is one of many possible worlds, that if you came to this world from some other planet, this would be a science fiction world."
- Neal Stephenson

Cephalic Pattern Door  
  A door that only opens for specific people.  

Lars Powderdry, weapons fashion designer, had many demands on his time and needed his space. Private space.

Lars said, "It's frankly none of your business." And stalked past the small bunch of footers who had assembled to gawk... to the up-track of Mr. Lars, Incorporated...

The doors of Mr. Lars, Incorporated, shut, tuned as they were to his own cephalic pattern. He sealed off, safe from the gaping multitude whose attention had been jazzed up by professionals. On their own the pursaps would have been reasonable about it; that is, they would have been apathetic.

From The Zap Gun, by Philip K. Dick.
Published by Galaxy Publishing in 1965
Additional resources -

Compare to Dick's neural door lock from The Unreconstructed M (1957). The earliest reference to a biometric recognition lock is probably the phonographic lock from A Journey to the Year 2025, by Clement Fezandie, published in 1921.

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Additional resources:
  More Ideas and Technology from The Zap Gun
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to The Zap Gun
  Tech news articles related to works by Philip K. Dick

Cephalic Pattern Door-related news articles:
  - The Wisdom Door Knows You
  - Brain Scan Biometric Security
  - Business Leaders Brain-Scanned
  - Brainwaves As Biometric Identification
  - Use Your Brainwaves As A Password

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