
Transcriber's Note: Transcriber's Note: This e-text was produced from Astounding Science Fiction, June, 1955. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.
A brilliant but unnerved philosopher arrives at a quiet office clutching a paradoxical coin, its two sides each declaring the other false. He brings with him a mysterious two‑foot sphere unearthed on a remote island—an object of unknown composition that, when illuminated, casts hundreds of alien symbols in intricate sequences. Intrigued, the interviewer sifts through newspaper clippings and photographs, trying to grasp the nature of the sphere’s material and the baffling patterns it produces.
The story follows their cautious dialogue as they confront the limits of language and logic. With each exchange, the philosopher hints at a hidden key that might unlock a communication system far beyond human knowledge, while the analyst wrestles with the unsettling possibility that the sphere belongs to a civilization far more advanced than our own. Their exchange sets the stage for a mind‑bending puzzle that challenges perception, time, and the very meaning of truth.
Language
en
Duration
~10 minutes (10K characters)
Publisher of text edition
Project Gutenberg
Credits
Produced by Greg Weeks and the Online Distributed Proofreading Team at https://www.pgdp.net
Release date
2008-01-02
Rights
Public domain in the USA.

Best known for helping reveal the brain’s internal map of space, this Nobel Prize-winning neuroscientist changed how we understand memory, navigation, and the sense of where we are.
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