You are until you aren't

It's bright until it's dark
it's on until it's off

it watches until it is blinded
it creeps until it seizes

It works until it sleeps
it makes sound until it can't

You live until there is nothing left for you
you breathe until capacity has reached it's limit

you wonder until they make you stop wondering
you think until the train leaves

You sing until the music dies
You play until your muscles are worn

You drink until you hunger
you feed until you thirst

You capture until it can not be captured
you write until the words run out

You are until you aren't
and that's the way it always will be.