The story began with poles. Then on top of them was constructed the framework for a roof. The bales just remind us that it is going to be a barn. The chickens were fascinated.
Then the roof was fixed, and the inside was filled.
Close scrutiny will reveal that the bales do not so much fill the barn as form walls. So you have to come and look inside.
It is a stage for a nativity play, a refuge from foul weather or a literacy corner. It can be anything you want it to be.
Teddy got there with his story books just in time for the visit of an OFSTED inspector.