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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Selective Electric Eye  
  A facial recognition device.  

Then she turned to the entrance.

But the selective beam of the electric eye refused to swing open the portal. Already the orders of the master of the house had barred the door against her. The actuating mechanism that should have operated by the imprint of her image on the telephoto cell, remained dead. She stared uncomprehending for a moment, then a flush of anger suffused her cheeks. The little fists clenched. "Oh, despicable!" she exclaimed, "he's made me a prisoner, a prisoner in my own room!"

Well she knew the futility of battering furiously against the barrier. None but those for whom the mechanism were set could pass through.

From Exiles of the Moon, by Nat Schachner (w. AL Zagat).
Published by Wonder Stories in 1931
Additional resources -

Compare to face recognition sunglasses from The Water Knife (2015) by Paolo Bacigalupi and the cephalic pattern door from The Zap Gun (1965) by Philip K. Dick.

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Additional resources:
  More Ideas and Technology from Exiles of the Moon
  More Ideas and Technology by Nat Schachner (w. AL Zagat)
  Tech news articles related to Exiles of the Moon
  Tech news articles related to works by Nat Schachner (w. AL Zagat)

Selective Electric Eye-related news articles:
  - UK School Face Recognition: Kiddie Orwell Tech
  - Chinavision Face Recognition Door Lock
  - Merchants Get Face-Recognition Via The Cloud
  - US Customs Now Doing Facial Recognition At DC Airport
  - Amazon's Rekognition System Sees Criminals In Congress
  - Chinese Face Recognition Mistakes Bus Ad For Jaywalker

Articles related to Surveillance
Airport Security Now Using Predator-Style Heat Vision Helmets
'Alexa For Residential' A Landlord's Dream (Tenant's Nightmare?)
Foiling Facial Recognition, Fighting Coaster Viruses, Harlan Ellison-Style
Adversarial Pattern Shirts Confound Object Detection Systems

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