Many scientists, especially quantum physicists, are accepting the fact that all things in the Universe emit energy. They know this because the energy can be detected using advanced bioelectric technologies. One of these technologies is called Kirlian photography.
Your students will "LOVE" these Op Art Hearts, and you can sneak in some lessons about warm and cool colors. They will also learn about how shapes can create illusory contours and how lines can be used to make a heart look 3D.: