Definitely check out this home, featured in Dwell, November 2012. It is basically one giant winding staircase with larger "steps" serving as rooms. The material contrast between the steps and the walls really highlights the staircase. I love how the Dwell article bills it as a "921-square-foot, 44-level house." Amazing.
Project: Coil House, by architect Akihisa Hirata. More photos can be seen on Dwell and on the architect's site.