Sometimes the medium is very much a part of the message. This public service display to warn people about the dangers of unsafe drinking water was created for Worldwide Day of Water by BDDP Unlimited in partnership with NGO Solidarities International. Essentially, BDDP constructed a “liquid poster” in the heart of Paris, using AquaScript technology. Developed by German artist Julius Popp in 2008, AquaScript’s proprietary computer and software system can be programmed to synchronize hundreds of magnetic valves to expel drops of water on command, forming any number of words and images out of pure liquid. Words literally rain down from spouts. Lately AquaScript displays have been appearing all over the world at trade shows, new product unveilings, casinos and nightclubs, and even as the centerpiece of posh parties in Abu Dhabi. It is still a novelty that causes people to pause in wonder, but when the technology is used strategically, as in this clean water campaign, it can add strength to the message and be more than the latest fascinating gimmick.