Then, take out a piece of colored paper and fold it in half along the center line of the square, and then fold it in half.
Four marks appeared after opening.
Then fold the other side, fold it in half and then fold it in half.
As shown in the figure, the open crease divides the square colored paper into 16 small squares.
Fold the small squares at the four corners of the square diagonally in half.
After folding in half, fold the rectangular area where the folded part is located inward, as shown in the figure.
After folding, turn it to the other side.
As shown in the figure, fold the outermost two small rectangles in the eighth step inward.
Next, insert one rectangular area into another rectangular area until it is completely inserted, as shown in the figure.