Space Saver: Ceiling Shelf

I heart this clever use of space from Apartment Therapy! I'd love to do something similar in my aparment someday. My collection of colorful Pyrex bowl would look particularly dashing in a shelf like this. I wonder how they managed to make the shelves float without any support from beneath? Maybe those vertical dividers are also supports? In any case, it looks like the work of a proper carpenter not your average handy-Jane, like myself. Love, love, love the idea, especially for tiny New York City aparments where there are simply not enough places to stash all your stuff.