Here's how the trick looks: you show two different "boomerangs." In this case you have a boomerang that is red and a second that is yellow. Spectators can see that the yellow boomerang is longer than the red boomerang. You cast a “spell” on the red boomerang and suddenly, it's larger than the yellow boomerang. Depending on how you want to present this trick, you can cast one more spell to make the boomerangs the identical size and overlays them on top of each other.
As you can see in the picture, the illusion is quite convincing.
Turn to next page to learn the scientific principle and secret behind the magic trick.