Levitating Water Drops

The illusion works by flashing the surrounding lights at certain speeds, if it flashes slightly slower than the rate of falling water then the droplets will appear to be going down slowly. If they flash slightly faster, the drops will appear to be going up slowly, because the bulb flashes and you see the drop at lets say half way, then it flashes again slightly before the next drop gets to half way so it looks a bit higher.