Atelier OPA is a product and furniture architectural studio based out of Japan. Many of their designs in recent years have taken a very minimalist turn using cardboard and other simple materials.
The latest from Atelier OPA is a unique cardboard shelter incorporating two basic designs. The structures start off by coming in a single sheet of cardboard. The sheet has pre-cut indents so users know when to bend and connect to create the cardboard shelter. In the end the shelter can sustain one or two persons. It may be a great way to give homeless people an inexpensive roof over their head and keep others in need dry. I couldn't imagine it being very permanent but Atelier OPA have really designed a shelter in its simplest form.