Where are we

Look around you
Is this the world,
This place you call home?

Or is it just a stream?
We be the fish
Swimming along helplessly?

Or maybe we are in a box
Fighting to get out
But no-one can hear out cries?

No! we're in a big cupboard
That's why it gets dark
When someone flicks a switch...

Maybe we were right all along?
We are on earth

But it doesn't explain everything...