This short documentary, shot in the glass factories of Leerdam and Schiedam, demonstrates how glass blowers do their work. But thanks to the superbly edited ballet of working hands and the sequence of mechanical motions of the engines, is it especially a cinematic tour de force. That the industry can’t do without man’s involvement is shown in the scene where we hear the voice of Haanstra himself counting the bottles on the conveyor belt, until one bottle breaks…

• Documentary