What Am I?

The gleam within the dream
The ear within the song
The germ within the seed
The eye within the storm

I don’t hang around long

A touch of a brain-breeze
A glimpse of a bee’s knee
A thought on the wing
A firefly’s glow

I make a small light wherever I go

I can come in the sun
I can come in the rain
I can come when you’re
Simply gazing from a train

I unlock your creation
My name? Idea