This is the key of the kingdom.

This is the key of the kingdom.
In that kingdom there is a city.
In that city there is a town.
In that town there is a street.
In that street there is a lane.
In that lane there is a yard.
In that yard there is a house.
In that house there is a room.
In that room there is a bed.
On that bed there is a basket.
In that basket there are some flowers.
Flowers in the basket, basket in the bed, bed in the room, &c. &c.