Dendritic patterns in the sand where water drains down the beach as the tide ebbs at Bay of Skaill in Orkney.
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Jessica's Nature Blog 
Patterns repeat in so many organisms and entities. It is amazing.
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Natural shapes are amazing. These look like rivers running through mountains (as seen from a great height, that is).
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Yes, and so many near-identical natural patterns can be found in entirely different materials and elements.
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You are right. Many basic types of pattern can be found repeating themselves in different natural situations. I once took dozens of (very poor quality) photos through the thick glass of a plane window flying at a height of 30,000 feet over mountains ranges and river systems in the States – and they do look like these beach drainage patterns. Maybe I’ll post the images sometime.
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I first saw these on my phone. In ‘big’ on the computer they are amazing. Definitely some primitive cave art in there (specifically the fish…)
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Thanks, RH. I didn’t notice the “fish” until you pointed it out.
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