The poem
In a corner of the bedroom is a great big curtain, Someone lives behind it, but I don't know who; I think it is a Brownie, but I'm not quite certain. (Nanny isn't certain, too.)
I looked behind the curtain, but he went so quickly - Brownies never wait to say, "How do you do?" They wriggle off at once because they're all so tickly (Nanny says they're tickly too.)