Recently I experimented with taking extreme close-ups of a Pacific Sand Dollar (Dendraster excentricus). The spines on the top (aboral) surface are club-shaped, which creates very interesting patterns:
Beautiful, aren't they?
P.S. I've written about sand dollars on the NHBH a few times, but the first post called "Petals and grooves" is a good introduction if you'd like to learn more about these fascinating relatives of sea urchins.
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