The geometry of the water bomb: turning paper into a locked sphere
In short: Origami is often seen as mere decoration, but creating a 'water bomb' requires precise engineering. By manipulating a two-sided sheet through specific book folds and diagonal intersections, you create a structural base that can be locked into a three-dimensional shape using hidden pockets.
The process begins with the creation of a water bomb base, a fundamental origami structure. This starts by making 'book folds' on both sides of a paper sheet, ensuring all edges align perfectly to reveal only one color on the outside. From there, diagonal folds are made from the bottom point to the top corners. When these layers are rotated and flattened, they form a four-sided pyramid shape with two flaps on each side. The maker must ensure no extra color shows during the initial book folds. The paper should be oriented with the white side facing out as it is folded up. These steps establish a clean visual transition for the subsequent diagonal work.
The transition from a flat 2D shape to a 3D object involves symmetrical folding of the outer corners toward the center line. The instructions require bringing both left and right corners to the top, flipping the paper, and repeating the process on the back. This is followed by folding additional flaps into the middle until all points meet at a single central spot, creating a compact, multi-layered structure. Each corner must be brought directly to the top of the sheet. After flipping the paper over, the same sequence occurs on the reverse side. The goal is to have all flaps converge at one exact center point.
The final 'lock' is what differentiates this from simple folding. By identifying specific triangle panels, the maker creates both a tab and a pocket. One panel is tucked inside the other, sliding underneath to hide completely. This maneuver provides a structural lock that keeps the ball flat and secure without the need for glue or tape. It relies entirely on the tension of the paper and the precision of the initial geometry. The maker uses a specific triangle panel as a tab for this maneuver. This technique requires some maneuvering to slide the piece fully under the other sheet. It results in a very tight lock that maintains the shape's integrity.
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Sources
- Summary by Intellect · source: How to Make a Ball | Origami
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