How do paper cranes fold paper?

Fold the square paper in half along two diagonal lines in turn, press it into a small square with the size of a quarter of the original paper along the center line, fold the unopened edge inward into a rhombus along the four corners of the small square, and then fold the obtuse edge of the rhombus inward based on the center line of the rhombus, with one side that can move freely folded upward and one end folded into a crane head shape. After the modeling, the paper crane can be folded. Details are as follows:

Step 1: Prepare a square piece of paper.

Step 2: Fold the paper into a triangle along the diagonal of the paper.

Step 3: Fold the triangular paper into a small triangle along the center line of the triangle.

Step 4, align and flatten the active angle and inactive angle of the small triangle to form a small square.

Step 5: Open the outermost side of the small square and fold it diagonally into creases.

Step 6: Fold the square active angle inward based on the four vertices.

Step 7: Fold the four corners of the small square in turn to form a diamond, as shown below:

Step 8, take the diagonal of the short side of the diamond as a reference, and fold the diagonal of the diamond inward.

Step 9: Fold the four obtuse angles in turn, as shown in the following figure:

Step 10: Change the angle, turn the flat surface out and hide the uneven surface inside.

Step 1 1: Fold the end that can move freely up and down to the end that cannot move freely.

Step 12: Fold a small corner at the top of the just folded end as the head of the paper crane.

Step 13: Take the wings at both ends, roll them outward, arrange the shapes, and the paper crane will be folded.