How to make a simple square origami tube

(page 9)

15th picture of simple square origami tube

15.

Apply the horizontal mountain-fold of the step #14.

Prepare to apply a horizontal mountain-fold without rotating the origami tube model by 90 degrees.

16th picture of simple square origami tube

16.

Apply a horizontal mountain-fold of the step #15 without rotating the origami tube model by 90 degrees.

Prepare to rotate the origami tube model by 90 degrees.

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