When I was watching this film I kept wondering who was the up, who was the down and who was the fragile among the three girls . However as the film ended unexpectedly and left all the puzzles unsolved, and the answer to my question was not important anymore. Maybe each of them was all of it, maybe none.
The unpredictable plot generates a prima facie sense of chaotic confusion and realistic spontaneity, but taken as a whole the film is fundamentally a closed system of predetermined meaning, i.e., semiotic.