This rendering by architect Stefano Boeri features the first urban vertical forest, Bosco Verticale in Milan. The pair of apartment skyscrapers are built to sustain the equivalent of acres of forest extending towards the sky.
"Put kitty on a shelf: In the words of Jackson Galaxy ”Cats need vertical space; it enables them to survey their world from a safe perspective.” If you don’t have room for cat towers, or just don’t like their aesthetic, cat shelves are a great alternative. The cat shelves in my apartment double as modern art!" http://www.urbanpethaus.com/content/wave_perch.htm