Honeycomb structures; may be dynamic and expanded as a sort of umbrella since pressure is lower higher up above the clouds. I guess a nifty construction with tiny small mirrors can direct lots of solar energy and work as sails, controlled by smart bending compliant mechanisms. Also - regarding flying objects, I've always wondered if a rotating disc, ie frisbee falls slower to thee ground because of atmosphere interaction, or if it's still falls slower in a vacuum with other forces at work. Well, still rails and boats are good stuff. I really like that honeycomb for an -n dimensional space construction idea.