[bkepley]

Proabably made by humans. But if so, still surprising that such elaborate patterns can be accomplished without detection of the perpetrators during the act.

Actually they have been detected and filmed in the act.

[luvbach1]

Actually they have been detected and filmed in the act.

Creating the recent one in Germany? I didn't see that in the article. I know people have been seen creating some of these patterns around the world.