And vary (by reason that ever it matters much
With what seeds, and in what positions joined,
And what the motions that they give and get),
Forthwith most easily thou mayst devise
Why what was black of hue an hour ago
Can of a sudden like the marble gleam,--
As ocean, when the high winds have upheaved
Its level plains, is changed to hoary waves
Of marble whiteness: for, thou mayst declare,
That, when the thing we often see as black
Is in its matter then commixed anew,
Some atoms rearranged, and some withdrawn,
And added some, 'tis seen forthwith to turn
Glowing and white. But if of azure seeds
Consist the level waters of the deep,
They could in nowise whiten: for however
Thou shakest azure seeds, the same can never
Pass into marble hue. But, if the seeds--
Which thus produce the ocean's one pure sheen--
Be now with one hue, now another dyed,
As oft from alien forms and divers shapes
A cube's produced all uniform in shape,
'Twould be but natural, even as in the cube
We see the forms to be dissimilar,
That thus we'd see in brightness of the deep