“Self protection (self defense) is more than learning a few simple yells or carrying a spray to ward off attackers. It is a habit of mind. The issue is more complicated than one simple defensive technique. You may not think you could hurt a large, muscular attacker — but you can. Everyone has weak points.”
heartShapedBox uses sound as the only means to protect itself from beeing explored too intimately. It has been shown at the Linux Audio Conference 2008 in Cologne (Germany).