Think bubblejet printer.

I think U2 just found their next stage backdrip.

To clarify the bubblejet printer analogy. Or inkjet for that matter. Consider that it's not water, but ink. Below it is a sheet of paper traveling a along at a a speed equal to each drop of water. Since each drop of water looks in two dimensions like a dolphin or a kanji symbol, they drop upon the paper one after the other. And so they drop upon the paper one after the other creating the same picture.

Actually this works better if you think of them as an old dot matrix printer. Since this is simply a group of dots dropped in a single line. Newer printers use a matrix of dots that are a plane figure instead of a line. And of course they use several colors.

But the concept is the same.

There was a fountain like this at the Coca Cola pavilion during the 96 Olympics here in Atlanta... looked very cool at night with the colored lights making the designs glow.

Good analogy, Splunge. Still neat, though!

Yeah, good analogy, Splunge. I was thinking more about those LED crawling signs where the words scroll across it sideways; same idea.