Feldman Architecture does some really nice doors in their work. The pivot doors are great...as I've just learned, Pivot doors swing elegantly on a central hinge, rather than customary side hinges connected to the door frame. According to Rixon, a manufacturer of pivot door hardware favored by Feldman, "Pivot doors are designed to work with the laws of physics to provide long-lasting performance and reliability. The weight of the door is supported entirely by the bottom arm, which is directly connected to the pivot spindle."
I love it when a designer makes something really special out of something very functional.