I had a genuinely surprising moment the other day when this guy sat next to me on the tube and said " So... I'm not the only one." and was folding a 20 pointed star.
He left a completed one on the seat when we left and gave me a piece of the puzzle to look at myself. I am still grappling with the equilateral triangle that it all involves. I have since found a way to make a tetrahedron( 4 equilateral triangles forming a regular geometric 3d object)out of 3 pieces of paper and a geodesic shape currently a rock or lump but it may grow into a icosahedron (a 20 sided object or D20 if you play role playing games).