Control a steadily flickering light illuminating the water drops. When the frequencies of the water drops and light flashes match up, the drops appear to be standing in mid-air. If the flashes as faster, the drops seem to be rising back up to the faucet.
Scientific Principle: Stroboscope - used for measuring periodic motions and speeds of rotation
Needed Infrastructure: Electricity and complete darkness
Size in mm: height: 330
depth / length: 500