: Turn the paper over so the folded bar is on the back. Fold the entire paper in half vertically, so the "smooth" side is on the outside and the folded bar is on the inside.
The sound is caused by a rapid change in air pressure. When you thrust the popper down, air gets trapped in the pockets. The force pushes these flaps out at a high velocity, creating a that we hear as a pop, similar to popping a paper bag. pop_design_somebody_called_me_tonight
: Fold that same section down again 3–4 more times until you have about 2–3 inches of paper remaining at the bottom. : Turn the paper over so the folded bar is on the back