I watched this little whirlpool come and go in a tide pool, its state varying with the influx of water from the ocean. Sometimes it disappeared altogether, but usually returned.
What first drew my attention was not the whirlpool itself, but the shadow on the floor of the tide pool, which varied from fairly circular to heart-shaped.
Graham's Island 
How fantastic! Not something you see to often I should think?
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No, but just a little detail that could be so easily missed. I was happy to see it and how it changed from moment to moment.
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