How the 40-Foot Inflatable 'Division Bell' Head Moved and Spoke on Pink Floyd's 1994 Tour

The giant inflatable head that loomed over the audience during “Keep Talking” was a 40-foot-tall nylon replica of one of the two metal faces from the Division Bell album cover. It was built by the same team that handled Pink Floyd’s stadium-scale effects—Air Artists and the designer Mark Fisher. The head was kept aloft by internal fans, but the real trick was the pneumatics.

A separate air bladder inside the jaw allowed it to drop open in sync with Stephen Hawking’s synthesizer voice, controlled by a computer that triggered solenoid valves. The whole head could also rotate side to side and nod,