Ice is a boundary like a beach is a boundary.
Ice is a boundary between life and not-life, or stasis.
A boundary between earth – solid – and water – fluid.
It is the fluid things, the emotions, the choices, the dreams, and the desires – frozen. Not moving. Waiting to thaw.
The thaw will come, when it is time. It might be a season, or a century, or a millennium. Depends on the ice, and the conditions around the ice.