I expected it to be tremendously sad, but it wasn't. All right, it was a little sad.
There were a few creepy shots which took me completely by surprise. Everything was ephemeral and doubtful. Subtle science fiction like this makes you question every day reality. Because it was believable.
Its incredibility was handled in such a way to make you believe. Visually beautiful, haunting in sound, understated, and gripping.