Both Uses of

contrast
in
Childhood's End

I am well aware of the fact that we have also inhibited, by the contrast between our civilizations, all other forms of creative achievement as well.†
Chpt 20 *

contrast = notable difference

That rocky island, with its brooding volcanic cone, was such a contrast to this peaceful spot that it sometimes frightened her.†
Chpt 15

Definitions:

(1) (contrast as in: contrast their writing styles)
point to differences between; or compare to show differences
(2) (contrast as in: there is a contrast)
a difference -- especially a notable difference; or the side-x-side arrangement of things that draws attention to an unmissable difference
(3) (contrast as in: sharpen the picture contrast)
the difference between tones of an image -- as in a photo or video -- such as the quality of brightness or the intensity of shades or colors