It takes up less space and gives you a workout. And it's fun, too!
Vince Sorgentoni and Sam Adams lived in a tiny house called the Z Huis. At only 204 square feet, it was very compact. But it still had a kitchen, a bathroom, and two sleeping lofts. Adams Sorgentoni love rock climbing, so they decided to build a climbing wall into one side to provide access to one of the sleeping lofts.
Wishbone Tiny Homes of Asheville, North Carolina designed the Z Huis. Each one would cost about $65,00-75,000 to build. Sorgentoni and Adams eventually left their Z Huis because they relocated to Philadelphia and couldn't find a place to park it, so you might be able to buy the original. You can see more photos at Tiny House.