Strange phenomenon seen in a lake in Eastern Japan, a Hole in the Sea!

No is not a black hole eating the sea or the Dragon`s triangle(魔の海, Ma no Umi), but is so cool to see something that shouldn't exist in our world.

It is actually an art piece by Shiro Matsui:
"With sculpture the original material evokes a sense of weight and gravity, which expresses a sense of reality. This characteristic is the unique power of sculpture. With painting two-dimensionality is a given, yet we are able to share the illusion of time and space. With my piece I am trying to merge these characteristics, by using real materials in the real world, yet having the power of illusion that painting holds."