More after-storm phenomena are the patches of broken reeds that float downriver and sojourn in bays and quiet areas of water before they continue their journey toward the ocean on the next tide.
They form floating mats, held together by nothing more than some principle of physics that I couldn't begin to describe, but is probably rudimentary. What I like is that groups of reeds clump together in patches of almost the same size, making the mat look like it was created using embroidery stitches or a paintbrush with thick paint. Enlarge the photo to see what I'm talking about.
They clump and they move, staying in formations of their own making, like a school of fish or a flock of birds.
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