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Constructed from natural and recycled materials, including tires packed with dirt, Earthships are passive solar houses, meaning their entire structures—including windows, walls and floors—are designed to collect solar energy.

This solar house can be snapped together without tools.

The house Appelbaum shares with Hawkins — the first fully solar house tied to the power grid in Middle Tennessee — bears out this ethos.

Small successes can beget bigger ones, Price said, just as the little solar house he built in the ’70s was followed by a million-square-foot version in Tennessee years later.

I first felt this while I was a graduate student at Yale, and I designed and built the first solar house in Ireland.