I just skimmed it. Folks are having fun. :) The question isn't what material to use, it's how big do you have to be (with a given material) to float? You ca

I just skimmed it. Folks are having fun. :) The question isn't what material to use, it's how big do you have to be (with a given material) to float? You can always just make your sphere bigger, eh? (That's kinda the point. It would actually be really really inconvenient to live in a Cloud Nine, no?) Anyway, I'm also going to use kites. (E.g. Imagine the Cloud Nine with a skirt like the Rings of Saturn, rotating, with the individual "cells" of the kite membrane modulated to afford directional control... Or Magnus Effect "cilia" that manipulate the envelope of air around the sphere...)