The motivation for this ongoing series was Paul Jackson's model the Bulge, a small version of which is shown in 1 and 2.
All of these are pureland folds. (Only mountain and valley folds are used, and no rearrangement of layers is necessary.)
As pureland folds, they are also theoretically flat and all curvature is due to the natural paper tension.
Medium: elephant-hide (also known as Wyndstone marble) paper (text weight), 36 gauge copper sheet (12-15).
| 1. Bulge:16 unlocked. | 2. Bulge:16 locked. | 3. Bulge:32 unlocked (wet-folded). | 4. Bowl:32 unlocked. | |
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| 5. Bowl:32 unlocked, upside-down. | 6. Pyramid:32. | 7. Pyramid:32, top view. | 8. Pyramid:32, upside-down. | |
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| 9. A combination. | 10. Pyramid:16, flattened. | 11. Bowl:32, locked. | 12. Basic form in copper, curved. | |
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| 13. Bowl:16, in copper. | 14. Bowl:36, in copper. | 15. Bowl:36, side view. | 16. Roller from basic shape. | |
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