It is still the sea, obviously, but you can see that something has changed about the color. The low, broad rollers rock the ship as benevolently as ever; there is still nothing but ocean, yet the blue is gradually becoming tainted with yellow. And that produces not green, the way you might remember from your lessons in color theory, but murkiness. The glimmering azure has vanished. There is no more turquoise billow beneath the noonday sun. The boundless cobalt from which the sun arose, the ultramarine of twilight, the leaden grayness of the night: gone.
From here on: all is broth.
- From Congo: The Epic History of a People by David Van Reybrouck