You should maybe go to washroom before watching this video as it may have the same effect on you that staring at fire before bedtime has on others after they go to sleep.

The good folks at Canal City Hakata (a mall built around a canal in Japan) have a fountain that greets people with wonderful art that is "drawn" with water. Of course, to draw water one needs a pail or or paint, but to draw with water one needs only water and a fountain (though I am sure there is a comptuer involved here as well). In fact, as you watch the video you will see they also print with water - which would sure save me money in inkjet cartridges for my printer.  I doubt that Epson and Hewlett-Packard will ever allow that.