I jist saw one of these at a hobby shop in Indianapolis a few weeks back. The illusion is very convincing, but it was a small toy like the example that you postd. The illusion was only like fifteen dollars at the hobby shop.
I'd love to see one build an agrand scale, or even one the size to crate a human head. They effect of the small one is bewildering to the mind, to say the least.
To cointhe old phrase, "It's done with smoke and mirrors."