The BLDGBLOG Book as a Series of Word-Frequency Clouds

I got to playing around with Wordle yesterday morning, and began to make word-frequency clouds for the entire text, captions and all, of The BLDGBLOG Book (check out a few preliminary spreads here, by the way).

You can toggle the inputs; the following images thus represent everything from the 250 most common words to appear in the book to the 15,000 most common words (I'd be hard-pressed, on the other hand, to believe that there are actually 15,000 different words in the entire book).
Check out the Flickr set for more.

So I realize this won't be of interest to everyone, but I think it's pretty amazing, personally, to see an entire manuscript reduced to this.
For instance, is it possible to extrapolate from these things what the original book might have been about? Or could you write a new book based on these word-clouds, which you would then compare back to the original? If you wrote a book based on an existing book's word-clouds, would the word-clouds of that second book be the same? Or could you then write a third book based on the second book's word-clouds – etc. etc.?
And might it be possible for two very different books – say, a popular history of aviation and a new book about climate change science – to generate all but identical word frequencies?

As I joked on my Twitter feed yesterday, it's like Rorschach literature, literary cobwebs from which you can pick and choose new meanings. "Subterranean time museum." A "living tunnel designed outside." "Artificial concrete."
"Another else begins beneath nature."
"Much water writes landscapes."

If there's something called Wordle, meanwhile, it'd be interesting to see something like Roomle: a program into which you can enter buildings, or clusters of buildings, and the most common room-types come back, organized into hierarchical clouds. You plug all of New York City into the Roomle generator, and find that the most common room of all is...
For a student project, you then construct those Roomle clouds as real buildings, bizarre labyrinths of competing room-types in which a visitor could be lost for days. It'd be a kind of baroque postmodernism, mathematically reached.

(Wordle first spotted via Classic Detritus).