A Use for Big Data: Cracking the Voynich Manuscript
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And then analyze it to see if you can tell.
Once you add grammar you get things that are language, but are still gibberish until you write a dictionary.
The most notable example of this would be Tolkien's Middle Earth. He created tens of languages to various degrees of completeness. Qenya, for instance, is so complete you can write books and poetry in it. It's even taught at Oxford. That's elvish.
But dark elvish, the writing on The One Ring, has only been constructed to the extent that he could write that inscription. Nothing else of it exists.
Or you can even go for a much simpler example - a markov chain. "trained" on an English corpus it will produce texts that look exactly like English. But because it doesn't adhere to any grammatical rules it produces nothing but gibberish.
It's fairly obviously gibberish; so much so that you can tell just by looking. But the author wasn't really trying to make it have statistical characteristics that resemble natural language.
I think their title needs a question mark somewhere.
[0] http://en.wikipedia.org/wiki/Betteridge%27s_law_of_headlines)