Who's Behind The Door?

We sailed away We walked 2 thousand miles and then we slipped away We looked so hard But couldn't seem to find just what the world was for Now we know Just what the journey's for Looking out to the stars Think about what you are What do they think of you Animals in their zoo They haven't got the time Landing's not on their minds How do they have the nerve We're animals in preserve They watch us all They're only making sure that we don't trip and fall Now they look so hard But they can't tell us why they're here and just what for Because they don't know Who opened up the door