Who am I ?

I'm the darkness in the light,
I'm the left ness in the right,
I'm the sadness in the joy,
I'm the will you'll not destroy,
I'm the beauty in the beast,
I'm the sunset in the east,
I'm the world you'll never see,
I'm the slave you'll never free,
I'm the why not in the why,
I'm the spirit in the sky,
I'm the catcher in the rye,
I'm the twinkle in ur eye,
Who am I ???!!!

-Paraphrased from "Gin Soaked Boy"