Pattern-Forming Pufferfish

OK, pattern-formation-ophiles: Here is an "underwater crop circle" that was created by a single pufferfish. [What? Were you thinking about the pattern on the surface of its body or something when I brought this up? :)] An example of such a geometric structure was studied in this paper, so I hope some of the pattern-formation experts find it enticing.

(Tip of the cap to I Fucking Love Science.)