So, here comes the sectional structure diagram of a real product as it reports:-

And more about the inventor Lytro, which more information can be found at their website, for example:-

And some more illustrations: http://www.lytro.com/pictures/lyt-8/
At last, if you still won't believe it (just like me before), here is a latest YouTube demo by the CNet:- http://www.youtube.com/watch?v=JDyRSYGcFVM
After all, this is not a paperware. It is a real product with selling price(s)! At about $400 for the cheaper version, will YOU buy this Kaleidoscope-alike Toy or Pentax'? (Yes, I mean the Q!)