The ocean washes some pretty strange-looking things ashore from time to time—the dagger tail of a horseshoe crab, the gray aspic of a jellyfish bell, the snapped plunger of a hospital syringe. Among the strangest is a slim leathery pod a few inches long, tipped with four graceful horns. If you don't already know what it is, staring at it for hours may bring you no answer. Mutant chili pepper? Failed art-school project?
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