The biggest city

The city is huge
It’s the biggest city I’ve ever seen.
Because it’s the only city I’ve ever seen.
Long ago, there were many cities.
And they grew. And grew.
Until all of the cities came together.
And there was just one city left. As big as the world.
Then the city grew the only way it could grow: up.
And the city grew up so far, that the city became bigger than the world itself.
So far, the air got too thin to live in.
Sealed windows, and one fool tapping on the glass.
And then everything blew apart.