Rocks on the top of a dry stone wall seem to have more lichens than those lower down the wall, especially if the stone has a rough surface like this Old Devonian conglomerate which would have originated in strata on the top of Rhossili Down. The arrangement looks like a miniature garden.
This series of photographs was taken beside the path from Rhossili village towards the Worms Head Causeway.
Jessica's Nature Blog 
We have similar “gardens” on walls around here too and I really enjoy the variety of plants that are seen. I also find something similar on top of wooden posts.
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Good framing of this absolutely lovely rock.
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Thank you, Claudia.
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Thank you, Linda.
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This is my favourite so far. A little garden of its own.❤
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Thank you.
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‘The Secret Miniature Garden’, so to speak. 😊 Magical. 💚
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Thank you, Markus.
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