The Japanese photographer Yoji Ookata has made an amazing discovery just off the coast of Japan. While swimming near Amami Oshima which is at the southern tip of the country, Ookata came upon a large geometric underwater crop circle.
Ookata has been referring to the underwater art as the "mystery circle" since finding the 6-foot diameter circle almost 80 feet below sea level. He soon returned to the same spot with a film crew from NHK to document his discovery. What he found out was that these circles are made by a small puffer fish that spends days and nights creating this underwater work of art. They are meant to attract mates and to house eggs, which adorably rest in the centre of the circle.
An interesting tidbit about that puffer fish is that these sculptures are created with all but one single fin.