Well one could argue the world is quantum, so that would give you lots of examples! But more to the point: * The colors you can see on a puddle of water with a

Well one could argue the world is quantum, so that would give you lots of examples! But more to the point: * The colors you can see on a puddle of water with a bit of oil on it is due to interference [1] * Certain butterflies wings colors are not due to pigments, but to microscopic structures that cause interference. * One very striking example is superconductivity [2], where a material can conduct electricity without resistance, and expels magnetic fields, leading to magnetic levitation. * Diamagnetism: Since water is slightly diamagnetic, that is, it creates a small magnetic field that oposes an external magnetic field applied to it, things with lots of water can be levitated in a strong enough magnetic field. [3] [1] http://www.kentshillphysics.net/light-optics/thin-films-and-interference/ http://www.kentshillphysics.net/light-optics/thin-films-and-... [2] https://www.youtube.com/watch?v=4HHJv8lPERQ https://www.youtube.com/watch?v=4HHJv8lPERQ [3] http://www.ru.nl/hfml/research/levitation/diamagnetic/ http://www.ru.nl/hfml/research/levitation/diamagnetic/