Turbulence

Those silent waters weave for him
A fluctuant mutable world and dim,
Where wavering masses bulge and and gape
Mysterious, and shape to shape
Dies momentarily through whorl and hollow,
And form and line and solid follow
Solid and line and form to dream
Fantastic down the eternal stream;
An obscure world, a shifting world,
Bulbous, or pulled to thin, or curled,
Or serpentine, or driving arrows,
Or serene slidings, or march narrows.

---- From "The Fish" by Rupert Brooke
(Posted in Physical fluid dynamics by Tritton)