By Joe Simon

The most interesting and challenging questions don’t have a single right answer. Sure, 2 + 2 = 4. Everyone learns that in school. But what is the best design for a livable home powered entirely by the sun that can be transported anywhere in the world and assembled in just a few days? Solar Decathlon competitions worldwide have netted 274 different-yet-correct answers to this question since it was first posed in 2002.

Imagine building a single-family house with only hand-powered tools. Sounds crazy, right? Well, students from Clemson University built not just one such house, but two. They built a local version to stay in South Carolina and a traveling version to demonstrate this concept at the U.S. Department of Energy Solar Decathlon 2015 competition. Their Sim[PLY] construction method allows an average person to assemble pre-cut, numbered components with just stainless steel zip ties. It’s like a three-dimensional puzzle of a 1,000-square-foot home…that’s also a totally livable home.

It’s not easy to get 50 people to work together, meet deadlines, and exchange ideas on a long-term project. Sometimes, it feels like assembling a jigsaw puzzle. As the Clemson University team designed the U.S. Department of Energy Solar Decathlon 2015 project it calls Indigo Pine, that “puzzle” mentality may have influenced its approach.