juxtaposition

Description
When two unlikely things are put together to heightened contrast so as to emphasize the differences or similarities or to create an interesting effect.

Annotated examples

“I had formed the idea… that the new citizens of Dominion would applaud as we passed, weeping with gratitude and tossing fistfuls of poppy petals, but they only watched us, silently, with eyes like thrown stones.” — Harrow. A, The Everlasting

Effect: Expectations sit in contrast with the reality of Owen Mallory’s welcome. Vivid imagery depicts the warmth and softness of poppy petals against the cold, hardness of stones