I didn\'t really believe my own eyes when I saw this. Stunning:S

It works by flashing the lights at certain speeds, if it flashes slightly slower than the rate of the falling water then the droplets will appear to be going down slowly if they flash it slightly faster the drops will appear to be going up slowly, because the light 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. Again, stunning...