Halfway Down by A. A. Milne

Halfway down the stairs is a stair where I sit
There isn't any other stair quite like It.
I'm not at the bottom, I'm not at the top;
So this is the stair where I always stop.
Halfway up the stairs isn't up isn't down
It isn't in the nursery, it isn't in the town.
And all sorts of funny thoughts run round my head:
"It isn't really anywhere!  It's somewhere else instead!"