Abstract: Vessels systems are disclosed which change their shape as a function of their environment. This can include adopting to the amount of fluid held by the drinkware or the surface upon which it resides. The drinkware is therefore designed well for reside on both flat and irregular surfaces. As mass is added or removed from a vessel portion, a support system provides features such as measure, signaling, increased stability, and associated entertainment value corresponding to such features. The support system can serve to lower the center of gravity of a vessel when it is relatively full compared to when it is relatively empty.