chinese triangular modular units
1. First of all, prepare a square piece of paper, and then square of paper cut into 4 rectangles and fold in the middle of the rectangle.
2. The bottom of the left and right parts at the same time bends to the midline.
3. To flip the folded model.
4. And then on the left and right two 45 ° angle down collapse.
5. In accordance with the arrow points, will be folded under in the upper part.
6. Fold left and right parts.