"'Ask your bird,' he said, with a strange smile. 'He knows, for he flies and goes everywhere; but I know nothing, for I go nowhere.'

"'What! not even to the top of the tower in which you live? Do you not know what is behind that wall?'

"'Perhaps I have been there, but I paid no attention to it. I look at no one and nobody.'

"'Yet you see the bird. You know that?'

"'Ah! the bird is a thing of a different kind. All look at angels. That is no reason why I should look at the walls.'

"'What you say is very profound, Gottlieb. Can you explain it to me?'

"'Ask the red-throat. I tell you he knows everything. He can go anywhere, but never goes except among his equals. That is why he comes to see you.'

"'Thank you, Gottlieb. Do you take me for a bird?'

"'The red-throat is not a bird.'

"'What then?'