Hello, world! analyses the ephemerality or longevity of storage media and uses acustic signals for data storage. In a closed system, which is made up of a computer, a loudspeaker, 246 metres of copper pipe and a microphon, circulates a codified, auditory signal. Because of the acustic time delay in this system its possible to save data. Whereas the time delay and the storage capacity are getting bigger, because of the length of the copper pipes. (source: http://www.aec.at/de/festival2006/program/project.asp?iProjectID=13500)