just a big fat metaphor for a childhood...
...not that it's a bad thing. just don't expect a storyline or character development. (spoiler approaching) it starts out with a kid in a coffin, the good ole symbol of death and transformation. its the end of infancy onto childhood around when the infant attains a level of selfhood. a period of INNOCENCE! yes just like the title. i have to say the director does capture that balance of wild idyllic paradise and stifling menace quite well, that feeling we have when we're kids of everything being kind of utopic while still kind of like being in a prison. childhood is kind of like a prison, we're under the guidelines of adults and these guidelines temporarly keeps the innocent in and the menacing outside away. thus we get the whole butterfly from chrysalis metaphor. the older girls about to enter adolescene prepare the dance of the butterfly on stage. in the audience is the world of adults, sinister-sexual-and largely male. then their flung into adolescense wide eyed and scared but once they get their with all the boys they dang well like it. you can't get a more sexual metaphor that water spurting straight up out of a fountain and a budding young girl and boy giving each other the eye can you?
like i said there's not a lot of story and i found the first part a little boring. once i got what it was about, it was better. made me use my noggin'.
if this interpration has been posted before then sorry!