The origami cube is also called the waterbomb, and is a traditional Japanese origami model.
One of the ways that it is traditionally used is to accompany the crane model in a decorative composition with sticks - the flexible sticks are placed in a vase, and the origami waterbombs and cranes are hung on thread from the sticks. The sticks wave in the breeze, bobbing up and down...
The diagram will be published soon - in the meantime, watch the video!