I first saw the dinosaur one on an episode from "brain games" on natgeo. We humans identify faces judging by the placement of eyes. It's cool to see you try the same without relying on eyes.
Kahnemann calls them perceptual illusions, which is basically proof that "I have to see it to believe it" is not necessarily a good approach to life.
He explains it here:
RE: Simple self-made Optical Illusion