I'm particularly pleased to see it, because I think I had more fun with this than with any other article I've written. Mostly this was due to Margaret Mahy herself, whose work is always such a pleasure and a provocation. In fact, I was so into it while writing that I started (rather obviously) channelling her habits of thought and style, which could be a dangerous strategy, but in this case I think worked. And I also got to talk about Borges and John Wilkins - whose Selected Works I was once ambitious to edit.
Like the man said: "I thought it all out twenty years ago."