How to make an origami cube with a hinged top

(page 15)

27th picture of origami cube with a hinged top

27.

Rotate the origami cube model by 45 degrees.

Prepare to apply a 90 degrees "valley-fold" .

28th picture of origami cube with a hinged top

28.

Apply the 90 degrees "valley-fold" of the step #27.

The cube is now closed.