Ebert Review

I read the review Roger Ebert wrote of this movie, one part of which reads:
"The movie is like an infernal machine that consumes all of the energy it generates, saving the last watt of power to turn itself off. It functions perfectly within its constraints, but it leaves the viewer out of the loop. This may be the first movie that can exist without an audience between the projector and the screen. It falls in its own forest, and hears itself. It's the kind of movie that would inspire a Charlie Kaufman screenplay about how it couldn't be made."

That made me curious enough to get the film. After watching it, I have to say it seemed like a fairly normal film to me, I have no idea what Ebert was talking about. Does anyone?