Yeah, maybe. Certainly a theory. But that artist impression has 24 dots, so the odds of getting a circle might be the same as getting a well drawn rabbit, or a "lol :)" (pencilling it out 24 dots seems reasonable for a "lol :)").

But the fact we got a circle rather than something funny suggests it is probably a phenomenon that causes circles responsible. Circles are far more common in nature than statistics might suggest. Nature well knows circles.