Heart of Glass (Herz aus Glas) is essentially a treatise by Werner Herzog on the power and importance of art. Director Herzog was known to put his actors through the wringer to get the results he wanted. In this film, Herzog decided that the best way to get his people to dance to the crack of his whip was to actually put them under hypnosis! The dazed, zombie-like performances certainly fit the subject matter. This is the story of an 18th-century Bavarian glassblower who by virtue of his delicate work virtually casts a spell over his neighbors. When the glassblower dies, the townsfolk discover that he failed to leave behind the secret for his special ruby glassware -- and will do literally anything to find the answer. The word usually used to describe Heart of Glass is "haunting"; some viewers have gone beyond haunted and into "possessed." Watch carefully and spot director Herzog in a bit as a glass carrier.
~ Hal Erickson, All Movie Guide