Turns out it wasn't the doing of aliens who'd overshot a Nebraska cornfield or out-of-work art students with scuba gear. No, it was a masterwork by an amorous and talented male Takifugu rubripes, the poisonous pufferfish eaten by only the bravest sushi connoisseurs. Yoji found a series of small male fish working tirelessly, day in and night out, to craft these mate-attracting marvels using a single fin.