I love math. Maybe you already figured that out. So when I can combine my obsession with paper with some math, well, you can imagine it makes my day.
What can you make with a rubber band pop up pyramid? Other than the obvious Christmas tree?
You can make a pyramid "globe". It makes my head hurt when I think about it too hard.
I got the map from Carlos Furuti's site.
You can make a kick-butt CD holder with a few design modifications. Be sure to use heavy card stock and strong rubber bands.
How to assemble a rubber band pop up pyramid
Cut around the outline of the whole template but do not cut in around the hooks yet. Score dotted lines.
Fold the A tabs toward the center and glue down on top of the hooks. Let dry completely, and I do mean completely. If you cut the hooks when they're damp you will permanently weaken the paper fibers.
Cut around the hooks and cut away the triangles in the center of the hooks.
Holding the pyramid in the closed position (the hooks will nearly touch), measure the distance between the hooks.
Knot a piece of elastic thread into a loop that just fits between the hooks. Loop the elastic through one hook.
This is the kind of elastic thread that I use.
Flatten the pyramid so it looks like an envelope. Glue B1 and B2 together, C1 and C2 together, with the B and C tabs folded into the inside of the envelope. (Hooks not shown).
Grab the elastic with a crochet hook or needle nose pliers. Close the piece as much as you can and stretch the elastic over the second hook.
Extreme Cards and Papercrafting: pop up cards, movable cards, digital crafts and unusual papercrafts.