How to make a rectangular origami box III

(page 5)

7th picture of rectangular origami paper box III

07.

Apply four vertical valley-folds of the step #6 and then unfold.

Now, you have completed making a "8x8 matrix base" .

Prepare to turn the paper over.

8th picture of rectangular origami paper box III

08.

Turn the paper over.

Prepare to apply the crease pattern (CP) shown on the left.