The molecules move very slow and the level of vibration is very low. It is confined and limited by nature, very solid in appearance and controlled. Water has a higher vibration but is very closely related to ice. This is the mental realm of spirit. The lightest breeze will move it great distances with little effort.
Thoughts are like that.
They come and go with ease. Levels of consciousness programmed to make water at the most elemental level. This is the causal level of our nature, of spirit. Unconfined and everywhere. Vast and expansive.