This large, threefold spiral made of 21 circles was a hoax. De makers of this formation put down a document at notary's office and in that document was the complete plan how they want to make this spectaculair formation.

They needed 300 man hours for the complete formations and that is including the preparation of the plan. The strange thing is that the hoaxers didn't took no photo's or recorded the project by video.

Source: DCCCS.