http://blog.makezine.com/archive/2009/09/19/pyramid_puzzle_pattern.pdf Make: Projects - "Pepakura-cast" metal pyramid puzzle http://blog.makezine.com/archive/2009/09/make_projects_-_cast_metal_pyramid.html?CMP=OTC-0D6B48984890 2009-09-19 http://makezine.com/images/logos/rss_icon.jpg