How to do an object lesson from a paper airplane to a cross

This object lesson starts out as a paper fold looking like a house or the Tower of Babel. Then you continue to fold it to look like a plane. As you describe to the kids that man cannot build something that can reach to heaven. Then you can tear it to form the rocket, continuing the thought but then there is a pop when it turns into a cross. To the kids amazement they will want to know how you did it. I have used this in junior church and Sunday school as well as out on the street and in the park.
Objects needed:
Paper