Robert Louis Stevenson - Katherine

We see you as we see a face
That trembles in a forest place
Upon the mirror of a pool
Forever quiet, clear and cool;
And in the wayward glass, appears
To hover between smiles and tears,
Elfin and human, airy and true,
And backed by the reflected blue.

Robert Louis Stevenson

http://www.poemhunter.com/poem/katherine/