"Observe the life like a wise tree by the side of a calm lake! Do not move; just sit and observe! Observe the Sun, observe the storms; observe the wisdom, observe the stupidities!"

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Suppose a number of equal waves of water to move upon the surface of a stagnant lake, with a certain constant velocity, and to enter a narrow channel leading out of the lake. Suppose then another similar cause to have excited another equal series of waves, which arrive at the same time, with the first. Neither series of waves will destroy the other, but their effects will be combined.

— Thomas Young