In this final chapter, three models are presented that do not quite belong to any of the previous chapters. The Lightning Bolt and the Star Windows are es- sentially Sonobe-type models, but, unlike Sonobe models, they both have openings or windows.
The Twirl Octahedron is reminiscent of Curler Units (2000) by Herman Van Goubergen, but at the time I created this model I was totally unaware of the Curler Units. It was only when someone asked me if I was inspired by the Curler Units that it first came to my attention. Although the models seem similar at first glance, they are really quite differ- ent, as you will see. The Curler Units are far more versatile than my Twirl Octahedron units. With the former you can make virtually any polyhedral assembly, but with the latter you can only make an octahedral assembly.
1. Start with A 4 paper. Pinch ends of centerline, then crease and open the diagonal shown.
2. Pinch halfway points as marked.
3. Crease and open to match dots.