Insert the triangular flap of one module into the center pocket of another.
: Start with a square sheet. Fold and unfold it diagonally both ways to create an "X" crease across the paper. How to Make a Paper Cube Using Origami
: Flip the paper over and fold it in half horizontally, then unfold it. Insert the triangular flap of one module into
: Push the horizontal creases together so the paper collapses into a layered triangle. This is the standard "water bomb base". : Flip the paper over and fold it
Continue connecting the pieces at right angles. Each face of the cube will eventually be the center square of one module, while its flaps lock into the adjacent modules.
Tuck the corners under the existing flaps to secure the module into a parallelogram shape.
: On the top layer, fold the two bottom corners up to the top peak of the triangle. Flip the paper and repeat on the other side to form a diamond shape.