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His fame was an ephemeron, fading away soon after his viral moment.
The fireworks display was an ephemeron, lighting up the sky briefly before vanishing.
The rainbow was a beautiful ephemeron, disappearing as quickly as it appeared.
The artist's installation was designed to be an ephemeron, lasting just a few hours before it dissolved.
The fleeting conversation felt like an ephemeron, leaving a lasting impression despite its brevity.
