Figure 4.

The folding pattern (#104) presented in (b) was made from duplicating the wing-inspired unit cell from Haas and Wootton, shown in green in the bottom right corner of (a). This cell was mirrored along a horizontal axis formed by the top edge of the boundary, shown as a thick green dashed line. The resulting cell was mirrored in a similar fashion to create the third cell. Then the right row of cells was mirrored along the vertical thin green dashed line and offset half a cell. While the horizontal boundary lines were kept to continue the pattern, the vertical one was deleted for this iteration. Since the transformations are applied to an entire unit cell, the angles between the creases intersecting at the node in the middle of the unit cell are identical along the pattern.