The waterbomb origami pattern and model. (a) The waterbomb pattern formed by tessellating the waterbomb bases. Solid and dashed lines represent mountain and valley creases, respectively. A typical base is shown in blue, which is placed side by side forming the middle row. On the adjacent rows, the bases are shifted by half a base (red). Four geometric parameters: width of the base , sector angle , the numbers of bases in the longitudinal direction , and circumferential direction —completely defining the pattern. A, B, and C are the three groups of representative vertices. (b) Deployment of a card model of a waterbomb tube. The model was made from conventional cards of 0.3 mm in thickness obtained from stationery stores. The geometric parameters were ,,, and .