its not fake its simply an optical illusion. It works because there is no surface detail to focus on and its a symetrical animation. (The shadow of her with her back to you is exactly the same as when she is facing you)
It does whatever your initial subconscious tells it to do. Good example, take a windows button when not pressed in. Is it pressed in or out? You think it is out because your brain logic always makes you think that light comes from above, when of course its really flat. If you concentrate hard enough you can make it look pressed in (if you imagine light coming from below) It is difficult to do because your brain logic tells you otherwise, but free your mind and you will realise the truth, there is no spoon :)
It does whatever your initial subconscious tells it to do. Good example, take a windows button when not pressed in. Is it pressed in or out? You think it is out because your brain logic always makes you think that light comes from above, when of course its really flat. If you concentrate hard enough you can make it look pressed in (if you imagine light coming from below) It is difficult to do because your brain logic tells you otherwise, but free your mind and you will realise the truth, there is no spoon :)