Massive Esterel

Flashback ; is an interjected scene that takes the narrative back in time from the current point the story has reached.
In movies and television, several camera techniques and special effects have evolved to alert the viewer that the action shown is from the past; for example, the edges of the picture may be deliberately blurred, photography may be jarring or choppy, or unusual coloration or sepia tone, or monochrome when most of the story is in full color, may be used.