How to make a large flat rectangular origami box

(page 8)

13th picture of flat rectangular origami paper box

13.

Start applying two 90 degrees valley-folds and four 90 degrees mountain-folds of the step #10.

14th picture of flat rectangular origami paper box

14.

Continue applying two 90 degrees valley-folds and four 90 degrees mountain-folds of the step #10.

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