I honestly have no idea what to say about this movie.
If asked what it's about I'd be forced to answer with concepts, rather than plot points; it's about duality, divorce, resentment, madness, betrayal; so many things that I could probably list them all day, and still later think of some that I missed!
Filmed in Berlin, with an international cast (including a young Sam Neil) by a polish director, it at times has the look of a French art house movie, at time it borders on German expressionism.