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.
Mauritius Island is 2000 km (1240 miles) southeast of Africa. It gives off a stunning optical illusion that the island its on top of a large waterfall. There actually isn't much of a depth difference at all, but the receding waves are pulling the light colored sand out into the ocean, giving the illusion of a drop off.