First defocus your eyes so that everything is blurry (if you are a fellow contact or glasses wearer, just take out the lens).
Second, make a tiny, tiny hole with your hand so that only a little light can get through and hold it up to your now-unfocused eye.
Notice anything different? You can see clearly. This phenomenon is caused not by the small hole acting as a lens, rather it blocks light out except from one direction. What a lens does is it focuses the light into a single point.
Ever notice that if you look at something the foreground and background are blurred? That's because there is only one point at which the image converges at. Lucky for Humans, we have muscles to control the lenses in our eyes and thus the focal point. What the tiny hole does, is block light out, making it darker, but allowing our eyes to focus on the fore- and background simultaneously. While it is a neat little trick, it limits depth perception and brightness of the viewed object(s).
Pretty cool, Huh?
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