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Static charges?


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I posted this photo from a FB page.  I remember seeing something like it in the past but I refute the claims that it's static charges that caused it.  Anyone know how it happens?



Edited by Marc
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I remember an explanation about it from a materials scientist many years ago. As I recall, the visible patterns reflect stresses in the plastic, but I'm less sure about why the dust sticks to some area more than others. Static charge seems like a reasonable explanation. The areas under stress might have a slightly different charge than the areas around them. 

I know I can just wipe it off with a finger and see absolutely no other evidence of a pattern in the plastic. 

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A lot of discussion on the FB page where this photo came from but no consensus or even a majority opinion.

My money is on micro arcing, initiated by low grade lightning strikes and facilitated by dust and moisture.

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