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I was pushing back against window screen. And I was looking at pieces of a 12' diameter frame at the recyclers, trying to figure out how to make a pipe and tarp canopy (shopping there is cheap entertainment).
I've lain under one looking up. You can see through it close up, like those pin-hole glasses. So, maybe 10-20% permeable.
It comes down to what % of the air you are diverting. A body could be ALL vents and scoops under the fabric and it would look seamless.
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