Papercrafts and other fun things

After making the slice form sphere with a pop-up base.  I tried to insert the pop-up into an A7 envelope.  Much to my disappointment, it was...

I have always wanted to create a pop-up mechanism for my slice forms.   I think this rubber band mechanism achieves my goal.  Slice form bas...

A Rubber Band Pop-Up Slice Form Easter Egg Card This rubber band pop-up card is an engineering marvel.  It combines a rubber band mechanism ...