Tape, glue and fold … and yes, there is a bit of cutting involved in making the Crazy 20 box. What you'll learn from this project is more about cutting compound angles. Oh, and just for the record … a 20-sided, three-dimensional spherical box is formally called an icosahedron. We still like the name Crazy 20 better. Requires intermediate woodworking skills. Plan includes step-by-step photos and instructions.