the fact of two things being seen or placed close together with contrasting effect.“the juxtaposition of these two images”
This is a rather useful concept in art. The contrast of opposites can really help bring out the idea you are trying to communicate. In this sketch, for example, I have a Twi’lek woman fleeing from a massive ship that is just coming in to land. I was tempted to set the scene at a bloody sunset. Instead made the sky a clear blue through the clouds of dust as a way of alluding to the shattered peace this ship has caused. Whether or not my art was effective, juxtaposition is something to keep in mind as a form of contrast.