Walkway with a view

I have a fantasy about cities of the future. I’ll be walking on air. Well, almost.I’ll be high up, fifty feet above street level, using my own two feet, safe in a sort of cocoon. Say, a glass tube or a tunnel with skylights to let in fresh air and sun.Perhaps there will be art on the walls, or posters. Perhaps, I’ll break into a little shuffle or tap dance if nobody’s watching. Perhaps I’ll have