9. Fold the left and right points in to meet the central vertical line.
10. Unfold the previous step.
11. Unfold the right section.
12. Using the creases you just made, bring the right side in.
13. Fold the right section back up, squashing the folds underneath.
14. Repeat steps 11 to 13 on the left side.
15. Flip the paper over, from left to right.
16. Fold the left edge over to the right edge. Make sure the open ends are at the top.