The raw material used in Blow-Up comprises two shots from an old educational film about first aid: a man demonstrates mouth-to-mouth resuscitation on a life-size dummy; the dummy's chest rises and falls. Fruhauf introduces this scene into his own métier, turning the "blow-up" metaphor into an image with a false bottom. With the aid of a digital photocopier, the strip of film was reduced in size to a narrow ribbon, and Blow-up shows this transformation in reverse.