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That's when it collides with the skybox, like the sailboat at the end of The Truman Show.

Or like Apollo 8 in the incredibly funny book Unsong.

Unsong is extremely amusing to me for some reason. Something about how Scott comes up with reasonably sounding similarities and manages to make those relate to an overall story.

David Brin thinks so:

https://en.wikipedia.org/wiki/The_Crystal_Spheres

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