Spiral Staircases

I would love to have a home large enough to have one or all of these spiral staircases. They have got to be the sexiest thing you can have in your home.

I found these at curbly

Sustainable Home Design

Architect Kendricks Bangs Kellogg designed this home of gracefully arranged, gently curved concrete forms, all resting on cantilevered, shaped, concrete platforms, that span up to fifty feet and ten feet across. This home is designed for energy gains from the thermal mass.

More at materialicious