At a Holiday Inn in Tucson they have a waterfall in the lobby that pours over a flat ledge, about ten or twelve feet wide) and the water falls in a flat smooth sheet.
Half way to the bottom, it suddenly starts fluttering back and forth (towards the front of the falls, and also to the back of the falls at the same time).
It reaches the bottom in a spread out form like a normal water fall.
They told us that when the water is first turned on it falls in a flat sheet all the way down, but if they hit the side of the sheet with a pole, it will then flutter back and forth from the point it was hit, to the bottom all the time, until they shut off the water source.
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