Contrast

The source of picture:
http://www.rsiphotos.com/images/photos/ContrastTriangle2b-2.jpg

Contrast: noun,verb
Definition:
(noun):1. [uncountable and countable] a difference between people, ideas, situations, things etc that are being compared.
2. [countable] something that is very different from something else.
3. [uncountable] the differences in colour, or between light and dark, that an artist uses in paintings or photographs to make a particular effect.
(verb):1. [intransitive] if two things contrast, the difference between them is very easy to see and is sometimes surprising.
2. [transitive] to compare two things, ideas, people etc to show how different they are from each other.