In The Book of Life, I just noticed a very interesting graphic effect.
Manolo's hair swirl physically changes from scene to scene to face the camera.
This effect occurs constantly but is never animated. The change occurs at every off-camera opportunity. It's even sneakily done in the middle of one scene when he passes behind another character.
This artistic effect seems very unusual. Is there a name for this technique in movie-making? Has it been done before?