We guide & encourage them to modify their designs so they can understand the importance of
cones & fins and
weight & size against
constriction & pressure.
This is when we come upon ingenuity & variation.
This is the time to be amused by the sound the bottle cap makes when it hits the floor. And we get to see flying birds or bats, ejected human canon balls, thrown pencils, jumbo crayons, and trapeze acts. Then we get to laugh after our paper puppet flew so high it landed on a tree.