That sums up the idea behind WikiHouse, an open-source construction system. According to architect and founder Alestair Parvin, the concept behind the approach is that 3D models can be downloaded from a freely shared library and adapted in SketchUp for users to create their own custom homes. Once designed, the files are sent out to have the various components 3D printed or fabricated on CNC machines. The finished components are then delivered to the user with assembly instructions and sometimes custom tools — effectively to assemble as a large IKEA kit. The key value proposition here is that the library will grow and evolve with crowd-sourced design input as people use and refine the models. In Parvin’s words, “design by everyone.” Visit the TED site to watch the talk or read the transcript.