Into infinity
There is something to be said for the fact that if you have two parallel mirrors facing each other, and you try to use them to stare into infinity, your head gets precisely in the way of that single point where infinity converges in the mirrored distance. I am not quite sure what this "something" is; nonetheless, I am personally convinced that it is a sign that we should (quite literally) avoid putting our noses into things we cannot hope to comprehend.
I'm constantly fascinated by infinity. We humans seem to relish the idea that there is at least something that we cannot reach - infinity is always one more than what we have, one number away from the largest number we can think of, one reflection away from the scope of our vision. It perfectly epitomizes the human psyche - whether it's our romanticism, or our innate humility (which I doubt, since humans are notoriously arrogant), or something else entirely, we seem to relish not being "the best" we can be, or "the most important", or even "perfect". In fact we are constantly encouraged to believe not only that we have not done our best at any task we undertake (the age-old cliche of "you can always do better"), but also that we can in fact never perform a task as well as possible (the age-old cliche of "nobody's perfect"). Whether this is, as I said, some kind of inherent humility, or an excuse to underperform, or paranoia that we may never measure up to others...we humans do not deal in superlatives. Good thing? Bad thing? Who knows.
Well, that had nothing to do with infinity. Except maybe that infinity, along with perfection, God and other such "superlatives", are there as an incentive to constantly reach for greater heights, to constantly strive to achieve as close to perfection as we can....rather than to be content and happy with what we have. A double-edged sword, perhaps. I can't think of a better way to encourage progress and advancement; conversely, I can't think of a better way to encourage self-deprecation and perpetual discontent with ourselves.