This is the interior of an Earthship home. The self sustanible home allows you to "live off the grid", the homes maintain an interior temp. of 70-72F (22C) year round using the homes mass. ( See site), The walla are made with compasted earth filled tires, but here,concrete,then glass bottles in the wall allowing soft light to come in the room while insulating the home. Cost range $7000- 70,000.00 depending on life style. Interesting idea and earth friendly.