A fundamental law of physics is that energy can never be created or destroyed, only changed from one form to another. Create an object that will store potential energy, then convert into kinetic energy in an interesting way. Just like other rubber band powered toys, this butterfly operates on the characteristics of elasticity. When you turn the coil, the elastic band stores energy within it in the form of potential energy. When you release it, this stored energy is released, which causes it to spin. The force generated pushes the butterfly forwards. This project solves a challenge for the Physicist Skill.