Folder: Grzegorz Bubniak Folding method: Card folding method Photo: Grzegorz Bubniak Diagrams:Here CP: Description: This model is a fractal which is the three-dimensional analog of the Sierpiński carpet. It was folded from rectangles 2 by 1 cm. There is 3 456 units in it. It was really difficult to assemble them because of miniature size of units, so the tweezers were indispensable. Menger sponge (depth 3) would contain 66 048 units. That would be the real challange.