Illustration: setting associated with Baigong pipes (Mt Baigong, Delingha), ChinaIllustration
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Baigong pipes (Mt Baigong, Delingha)

Tubes in Mount Baigong, 40 km from Delingha, were sold as alien pipes.

natural (geological)

Iron-rich tubes in the rock looked like plumbing to some and tree roots to geologists. Which reading needs fewer guesses?

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Illustration made for The Nommo, not a photograph.

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