One of my favorite surfaces is the hyperbolic paraboloid. So, of course, all of my students need to know how to fold one from a square sheet of paper. Last night my BC & Multi students practiced their folding skills and today in class their quiz was to fold one on their own without the instructions. They certainly impressed me with their folding skills!
Here are the instruction (PDF). Try folding one!
Their homework creations:
The hyperbolic paraboloid lineup!
The hallway bulletin board: