There is an artificial double-comet speculated to be a galactic art piece, though it is still not known who created it. As the two crystal prisms rotate around a central axis, they take in the light from all the interstellar bodies around it and refract it back out like an ever-adapting kaleidoscope.
The first explorers named it an ark because the crystalline cave network under the surface is laced with an electrical grid, almost like it was meant to support a small community as it transported them through the cosmos.
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