Use your imagination and you can almost envisage trees bedding over and putting out hanging planting boxes from branches, or buildings developing arms that stretch out like trees and hanging growth areas from high in the sky fed by systems originating within the tall buildings, indoors or outdoors. Just use your imagination a bit! What have we not yet seen?
One reader suggests:
http://terraspheresystems.com/technology.html
Time is, was and will be. Without time we would not be. What a load it has to carry! Time seems eternal! You might even ask whether cycles in time exist? If so read Roger Penrose's book on new attitudes in physics towards possible "Cycles in Time".