I think it is scrambled nonsense but it's scrambled in a way that still makes it look like a plausible sample. I remember watching a video of Hinton saying that

I think it is scrambled nonsense but it's scrambled in a way that still makes it look like a plausible sample. I remember watching a video of Hinton saying that just using white noise or similarly randomized data does not work but I'm now forgetting why.