It's a dialogue movie, wherein the subject matter is situated within the dialogue between two character. But what is unusual about this movie is that, the camera lays flat on one angle at one level, recording only one speaker. And for a couple of minutes, the conversation goes on with the other speaker off-cam redefining a conversation movie where shot-reverse shot technique pretty does that trick.
The final sequence was sublime.
As the actors recite the text they remain absolutely still, maintaining sculpture-like poses (although the muscles in their neck and face tense up and release according to the rhythms and inflections conjured up by the text); so when they move - usually into another carefully considered yet naturalistic pose - it evinces an event-like quality.