How to make a long origami stairs

(page 4)

5th picture of long origami stairs

05.

Apply the vertical "gate-fold" and then "unfold" .

Prepare to apply four horizontal "valley-folds" and then "unfold" .

6th picture of long origami stairs

06.

Apply four horizontal "valley-folds" of the step #5 and then "unfold" .

Prepare to apply four vertical "valley-folds" and then "unfold" .