There are three known states in which substance is to exist:

A solid, which has a definite shape and volume.
Liquids, although having a definite volume, can only take the shape
       of that which contains them.
Gases; death and beauty in our conundrum; have no definitive shape,
      nor volume.

Ice
Water
Air

The ethereal nature that does exist,
An un-defining ethos,
This trinity of you.