Irina Alexandru's design is more of a coat hanger than a closet, but it's intended to allow for the maximum amount of clothing hangers in the smallest amount of space. I just plain like the curvy double helix design.
For those who are having flashbacks to biology class: Yes, a double-helix is actually nature's clever way of squeezing a heck of a lot of genetic information into a tiny coiled pattern. It's somehow almost fitting that the same design would make for efficient clothing storage, too. [Core77]