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.