in 1916 the American zoologist Asa Schaeffer observed that an amoeba placed on a cylindrical surface always moved in a spiral path around the cylinder. To further study spiral movement, Schaeffer blindfolded a right-handed friend and instructed him to walk a straight line across a country field. Schaeffer plotted his friend's track, which described a clockwise spiral form until the man happened to stumble on a tree stump.
From the aptly named Endless Forms Most Beautiful.
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