Very rough essay idea...

Just while I have it in my head, I haven't double checked the brief yet so I'm hoping that this is an okay idea. I wanted to write something along the idea of why metamorphosis is used to portray such different messages. How it can be used to mean such different things in different films. After watching the films this is definitely one of the things I've been most interested in. Is it too broad or dull though? I don't know...