@wonderofscience it very cool but it also hurts my brain when I try to comprehend it. It seems as if there's enough room in the path leading up to the wheel for a single boat going in a single direction, and the picture shows a boat departing on both top in bottom, going in opposite directions.
So... how do they accommodate boats exiting the top wheel and entering the top wheel? It doesn't look like there's enough room.
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