He can behold
Things manifold
That have not yet been wholly told,--
Have not been wholly sung nor said.
For his thought, that never stops,
Follows the water-drops
Down to the graves of the dead,
Down through chasms and gulfs profound,
To the dreary fountain-head
Of lakes and rivers under ground;
And sees them, when the rain is done,
On the bridge of colors seven
Climbing up once more to heaven,
Opposite the setting sun.

~ Henry Wadsworth Longfellow