forth across the circle, it dips and swells along with the design of the circle itself. it kicks up sand in specific valleys instead of just swimming through randomly.
more importantly, there is no reason you should expect to see a fully-made circle from start to finish as proof. the fact that this study was done by scientists, with the scientific method, should be enough if you really are interested in the work. the video is a bonus, and i agree that it would be cool to see a whole circle made from scratch on video. however, to make the suggestion that you won’t believe it until you see the video, 