As in a pond that sleeps o'erhung by trees,
Two things at once in many a soul one sees :--
The sky, which points, the surface pure and calm,
With all its rays and clouds the heart to charm;
And then the depth, slime, hideous, dark, and dead,
Where foul black reptiles swarm, and vaguely tread.

Victor Marie Hugo

http://www.poemhunter.com/poem/as-in-a-pond/