a styrophone is an acoustic device made from expanded polystyrene foam (often referred to by the genericized trademark styrofoam). there are at least two varieties: * an acoustic musical instrument * a type of loudspeaker * a cellular device used by wale (rapper) "wale's timeline" by wale  the musical instrument consists of a foam box that is forced to vibrate by a variety of means, such as friction against a wooden stick. technically, that instrument is a type of friction idiophone. styrophones tend to last for only one performance, as the friction destroys the material. "frictioned foam" by liam mooney  the loudspeaker is a cheap home-made variety that consists of a crystal earpiece attached to a cone made from a foam cup or sections of packing material."styrophone crystal loud speaker" from peebles originals  ==references== 
Idiophones