Here is a quick clip of the sea urchin, Strongylocentrotus purpuratus, taken by Adrian Reich of the Wessel Lab at Brown University. You can see the animal's tube feet moving between its spines. Check out creaturecast.org/archives/1085-tube-vision to read about how urchins might use these feet and spines to focus light and see shapes around them. Together the structures might function like a large compound eye. This work is provided under a Creative Commons Attribution-Noncommercial Share-Alike license.moreless
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