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The density of webs is much higher in this pasture giving an unmistakeable glitter path.
(Preventing internal reflections can be a big problem, as the bottom left image shows.)
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More heavily grazed pasture viewed close to sunset shows a clear main path with traces extending across most of the image.
Notice how the lines are short arcs centred on the sun.
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A closer view of the nearby webs shows the curvature quite well.
Only webs oriented along an arc centred on the sun show the effect.
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Canon EOS 20D 4th November 2006
Wiltshire, England