displacement
A technique commonly used in fantasy art where at initial glance the situation seems completely normal, but some detail within the picture makes it quite unusually abnormal. Intended to cause a double-take, where the viewer's initial (and subconscious) reaction is to recognize the scene as mundane and ordinary, but there is always something that ensures the picture will never be ordinary, replicable, or the sort of thing you see every day. Although not always subtle or hard to see, when it is, then displacement is what motivates the phrase "When you see it, you will shit bricks."