Amazing demonstration of the cognitive power of the brain (and why human spell checkers are so annoying). There are other simple congitive measuring devices that show clearly the unseen processing powers of the brain that are always running underneath the surface (the unconsious mind). One is 'The Necker Cube.' Google it and check one out. It's a simple 3-D cube drawn on a 2-D plane (like paper), and it shows how the mind can move and reshape the objects we see, without any movement in the external object at all. For me personally, in no way do I attribute any of this neural magic to spiritual explanations (not that there's anything inherently wrong with doing so), but in any case, the wide range and incredible capacities of the brain, above and beyond the conscious processes, is truly fantastic.