The Sun right now, over the Golden Gate. Only the deepest red can penetrate the smog.pic.twitter.com/1MEckdXYCS
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Hard to make a cylinder with any kind of significant power density with a pressure difference of only a few tens of millibar
However, you can make a balloon float with warm, moist air, so that’s something that you can do with related physics. Warm air balloon
I drew this. Maybe a very flat/wide cylinder like a pancake? Middle matters most, far sides avoid extra friction + max useful surfaces/vol.pic.twitter.com/1P1EE3kolf
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