chiaroscuro.

chiaroscuro

kɪˌɑːrəˈskʊərəʊ/
[mid 17th century: from Italian, from chiaro ‘clear, bright’ (from Latin clarus ) + oscuro‘dark, obscure’ (from Latin obscurus ).]
 1.  the arrangement or treatment of light and dark parts in a pictorial work of art
 2.  the interplay or contrast of dissimilar qualities (as of mood or character)

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