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The video below is of a small stream called Whiteoak Run on the Limberlost Trail in Virginia's Shenandoah National Park, looking down from the wooden bridge that crosses it. It's just a simple, unexceptional video of a stream. Except . . . except for the white circle in the center . . . a glob of foam caught in the current with no place to go . . . spinning about its own axis . . . its passage further downstream blocked by the formation of the rocks themselves.
Below the movie you'll find suggestions about how to use it
as a unique meditation.