Jay Shafer has a passion for building amazingly efficient houses. What are you passionate about? Leave a comment below or click "Read more" to see the most compact house you can imagine.

Follow this link to watch the video: http://yhoo.it/cnYy16 - 45 year-old Jay Shafer is not your typical entrepreneur. 10 years ago he decided to make a big lifestyle change and give up "luxury living." He lives in an 89 square-foot mobile home that he custom built and runs a business constructing small homes for eco-conscious customers.