Waterline

Looking down from a circling nautical flight, a seagull sees only 1/7 of the iceberg.  A seahorse's casual glance might reveal 6/7.  The iceberg sees neither seagull nor seahorse, calmly hovering part-way between surf and sky, singing his knowing song:

Float on, float on
Facets shining in the sun
Until at last, when day is done
And the good sun has had its say
I find, just as it has always been
The sea and me are one