1. Tools: square paper.

2. Method: Fold the two fold lines of the square, then align the two opposite sides inward and fold the fold lines, leaving a crease and then open. Fold the two diagonal lines of the square, leaving a crease, then open and turn over. Fold the four corners of the square inward to align with the center point, leaving a crease, open it, and turn it over again.

3. Return the two opposite sides to the inward-folded state according to the crease, push both ends inward, and press the four corners inward according to the crease to close the resulting shape. It's four small squares.

4. Fold each small square inward from the two sides starting from the center point, aligning with the center line, leaving a crease, then open and adjust the crease so that the edges of the paper are drawn inward. The resulting corners are spread outwards, and finally four sharp corners can be obtained.

5. Fold the right angle between each two sharp corners upwards to the maximum extent, then turn each sharp corner down, and tuck the tip part downward into the paper layer, finally obtaining an octagonal shape.

6. The last step is to turn it over, pinch the four corners of the bottom square, and adjust it to bulge. Then adjust the front side, and a beautiful octagonal box will be folded.