1. First, take out a square piece of colored paper, and fold the opposite sides symmetrically inward, so that the lines on both sides coincide with the center line and fold into a rectangle.

2. Fold a short midline crease of the rectangle, then both sides are folded symmetrically inward to the opposite side, so that the sideline coincides with the midline and is folded into a small square.

3. Then, pull out the two corners of the same side of the small square from the inside to form a trapezoid.

4. Similarly, after the two corners on the other side are pulled out to form a trapezoid, one corner on one side is folded 90 degrees counterclockwise with the center point as the vertex.

Finally, the diagonal of the folding angle is also folded 90 degrees counterclockwise with the center point as the vertex, and the simple windmill is folded.