en.wikipedia.org/wiki/File:Plan *squees*
When lichen are the last surface life on earth, these will run cellular automata.
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These are a very slow form of en.wikipedia.org/wiki/Belousov%
So, arguably the far future has lichen thinking at a glacial pace under the red sun.
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lichen scientists altering Earth's orbit just enough to stay within habitable range of the dying sun
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It's like Solaris, only with an endless desert instead of an endless ocean.