"The story is very simple- I'm not sure you can call it a complete story even- It is about how people create ideas/stories/fictions/social realities and communicate them or impose them on others. Thus Proog has created (in his head) the concept of a special place/machine, that he tries to "show" to Emo. When Emo does not accept his story, Proog becomes desperate and hits him. It's a parable of human relationships really- You can substitute many ideas (money, religion, social institutions, property) instead of Proog's machine - the story does not say that creating ideas is bad, just hints that it is better to share ideas than force them on others. There are lots of little clues/hints about this in the movie- many little things have a meaning- but we are not very "tight" with it, because we are hoping people will have their own ideas about the story, and make a new version of the movie. In this way (and others) we tie the story of the movie with the "open movie" idea." 