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"I wrote many novels which … contained the element of the projected collective unconscious, which made them simply incomprehensible to anyone who read them, because they required the reader to accept my premise that each of us lives in a unique world."
- Philip K. Dick

Palm Flower  
  It's like a life clock.  

"Show me your hand, Logan," said the psyc doctor.

Logan obeyed.

"Do you know why you have this?" he said, tapping the palmflower with an index finger.

"To tell my age," said Logan.

"And how old are you?"

"I'm six."

And what happens when you are seven?"

"It goes to blue... and I leave the nursery."

From Logan's Run, by William Nolan (w/G.C. Johnson).
Published by Unknown in 1967
Additional resources -

The implanted palm flower changes color every seven years; yellow (age 0–6), then blue (age 7–13), then red (age 14–20), then blinks red and black on Lastday, and finally turns black at age 21 - state-mandated death.

Compare to the cardioplate from Harlan Ellison's 1965 novel Repent Harlequin, Said the TickTockMan.

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Additional resources:
  More Ideas and Technology from Logan's Run
  More Ideas and Technology by William Nolan (w/G.C. Johnson)
  Tech news articles related to Logan's Run
  Tech news articles related to works by William Nolan (w/G.C. Johnson)

Palm Flower-related news articles:
  - Crystal Palm Flower: Logan's Run Life Clock on Ebay
  - Death Algorithm Developed In Japan
  - Tattoo Biosensor Warns Athletes Of 'The Wall'
  - Chromat Misfit Shine Tracks Health And Glows

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Amitabh Bachchan Wins Personality Protection
Bubloons May Be The Start Of Something Much Bigger
Sleeping Pods In Tokyo Railway Stations

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