The COS-e is a Cardboard Origami Shelter in case of emergency for refugees. It is based on an origami paper folding principle. The principle exists out of rectangular pieces of cardboard, which are folded in such a way it is possible to create a 3D double curved surface from a 2D flat surface. By folding the surface stiffness and strength are added. The entire structure of the cone can be folded into a relatively thin and lightweight package that makes the transportation to and the actual assembling on site easy and quick.

The folding structure is based on an repetitive origami pattern. This results into a fourteen angled cross-section that can be folded and unfolded around its central pivot point. The eventual shape is achieved by the fixed diameters at the top and bottom; the top joints are fixed allowing the structure to rotate, the bottom diameter is fixed by using cardboard tubes as spacers. 

While origami folding is commonly practiced with paper material of which the thickness is negligible, the thicker cardboard is much complex to fold. In the final design fabric is sandwiched between two layers of cardboard allowing only the textile to fold on the folding lines. With this method the sheets cardboard will not be damaged when (un)folding the structure.