This trait can allow for moving or growing markings, this can be a conscious choice (with practice!) but is often unconscious and tied to emotions or the general state of the Whiffling in question. An example would be a darker marking that moves or grows with anger, perhaps. This is NOT a form change or something that can otherwise completely change the Whiffling, and is restricted to one marking/coloration. Otherwise you would need a secondary copy of this Trait to affect multiple colors/markings.