How to make a tallest square origami box (page 9)

 

15. Apply the "valley-fold" of the step #14 and then unfold.   Prepare to turn the paper over.

16. Turn the paper over.   Prepare to apply four "valley-folds" .

 

 

 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20