Cool art made by... Well, let's see if you can recognize the author ;) (the answer is in the end of this post)

It's not easy to notice something like this, and nearly impossible to pass by without taking a picture.

I was happy that the author of this piece of art was not mind of me making photos :)

So, do you know who created this?

And here is the answer!

The author of this work is nature :)
Did you guess it right? ;)