The glitter path isn't very clear when the sun is high in the sky but small gusts of wind, cat's paws, can ruffle the surface enough to produce a similar effect.
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A couple of patches of ruffled water can be seen in the distance.
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5 seconds later and the appearance has changed as the gust moves across the water.
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4 seconds later.
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3 seconds later
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2 seconds later.
By now the steeper viewing angle is starting to wash out the effect.
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A closeup shows the small scale of the ripples induced by the gusts of wind.
The larger waves are about 10 to 15cm high.
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Canon EOS 400D 18th May 2009
Weinfelder Maar, Eifel, Germany