Quantum Levitation Demonstration at North Museum. The key to the levitator is the disc, which is made of superconducting material sandwiched between layers of gold and sapphire crystal. A piece of foam is placed on top and held in place with household plastic wrap. The disc is then dipped into a brew of liquid nitrogen (temperature: minus-300 degrees Fahrenheit)
I got the chance to try this once. Simple, yet mind blowing. The shape of sound demonstrated with salt. The plane is vibrated at specific frequency. The waves travel across the plane and at some places they add together and at other places they cancel out. Where they cancel out the salt sticks because there is no vibrations and at other places it just gets vibrated away.