Director Miroslav Slaboshpitsky does not understand sign language and had to have interpreters on set to communicate and make sure that the actors were sticking to the script.
The film is made up of only 34 shots.
All the actors are deaf and the film makes no use of any vocal language nor even subtitles, only sign language throughout. This may quite well be a first for a feature film of fiction.
The actors communicate in Ukrainian sign language - anecdotally, users of western European sign languages may understand about 70% of it.
Prologue: "This film is in sign language. There are no translations, no subtitles, no subtitles, no voice-over."