Take alook at those vessels.. they are defined as :
" Vessel may refer to:
a boat, ship, or starship
a container of liquid, such as a glass, goblet, cup, bottle, bowl, or pitcher
other kinds of storage or packaging containers
a tubular structure of vascular tissue in plants such as xylem and phloem "
to me , they are small tiny rooms that contain , protect, enclose and carry.. and when they are well designed, they are lovely rooms to own and display.