From The SpiritWiki
The Vessel is another word for the Physical Unit specifically, or the Physical Universe more generally.
Physical Unit > Physical Vesture, Temple of the Holy Spirit, The Body, The Body of Christ, The Vessel
"Vessel" It is a word useful when you wish to refer to the Physical Unit as a container (i.e. vessel) for Consciousness. The Vessel is the container into which Consciousness "descends." The Physical Unit as "vessel" for Consciousness is illustrated by the animation Water Glass animation.