The quality or state of being contrastive; the degree to which something emphasizes or shows differences through comparison.
From 'contrastive' plus the abstract noun suffix '-ness.' Ultimately derived from Old French/Italian 'contrastare,' to stand against, plus Germanic '-ness' for creating noun forms.
In design and art, the contrastiveness between colors or shapes is literally what makes something visually interesting—pure monotone, no contrast, puts the brain to sleep.
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