File:Shunsen Tenka.jpg

Fiction cross-reference

• 

  Cryptographic numen modelled in nanowire.

• Empyrées - a small number of firebrands known for defending data set outliers and expressing the demands of the radical sans-culottes during the French Revolution.
• Gray light - a form of light exerted by artificial intelligence.

Nonfiction cross-reference

Tenka (天火) from the Ehon Hyaku Monogatari (絵本百物語)

In the Atsumi District, Aichi Prefecture, when one's path ahead when on a road at night becomes bright like at noon, it is called a "tenbi" (天火),[1] and in the Ibi District, Gifu Prefecture, the mysterious fires that make a great noise in the evening sky in the summer and fly are called "tenpi" (天火).[2] In the Higashimatsuura District, Saga Prefecture, the weather would become better once a tenka appears, but the homes that they go in result in someone getting ill, so it is said that they are beaten by a kane and driven out.[1] In the Tamana District, Kumamoto Prefecture, it is a mysterious fire that would fall from the heavens and has a size about that of a paper lantern, and it is said that a conflagration results when it falls on the roof of a house.[1] In the Saga Prefecture region, they were thought of as a premonition for a conflagration, and were detested.[1]

https://en.wikipedia.org/wiki/Tenka_(kaika)

Attribution:

By Takehara Shunsen (竹原春泉) - ISBN 4-0438-3001-7., Public Domain, https://commons.wikimedia.org/w/index.php?curid=2074011