If we knew all the laws of Nature, we should need only one fact, or the description of one actual phenomenon, to infer all the particular results at that point. Now we know onlya few laws, and our result is vitiated, not, of course, byany confusion or irregularity in Nature, but by our ignorance of essential elements in the calculation. Our notions of law and harmony are commonly confined to those instances which we detect; but the harmony which results from a far greater number of seemingly conflicting, but reallyconcurring, laws, which Thoreau we have not detected, is still more wonderful. The particular laws are as our points of view, as, to the traveler, a mountain outline varies with every step, and it has an infinite number of profiles, though absolutely but one form. Even when cleft or bored through it is not comprehended in its entireness.

-Thoreau, Henry David
  Walden, or Life in theWoods,'The Pond inWinter'.

According to Pliny, painting was brought to Egypt by Gyges of Lydia; for he says that Gyges once saw his own shadow cast by the light of a fire and instantly drew his own outline on the wall with a piece of charcoal.

-Vasari, Giorgio
  Lives of theArtists (translated by George Bull,1965).