Many children have imaginary friends. Owen has an imaginary police force. He talks about 'my police' a fair amount. He explained to his great-grandfather recently that he had cooked a whole salmon for his police. The other day he told me that, when I can't see him, it's because he's in his police station.
He just explained the plot of Wall-E to Emily. Apparently, he went to see it, with his police, in London.
Ho hum.