Water is the source of life on this planet. Likewise it is the fluids (the main component of the body) which nourish and maintain the health of every cell. Water corresponds to the vital fluids, i.e. blood, lymph, mucus, semen and fat.
The kidney is especially linked to this element. Its motion is downward.
Water has the capacity to flow, infinitely yielding yet infinitely powerful, ever changing and often dangerous with the capacity also to nourish and cleanse.
Water is the ultimate yin; quiet, cold; representing the resting time of winter. It has a waiting, silent, still quality that can be described as “stored potential”.
It has flexibility (think of water filling up any shape of vessel), yet it has great power (think of the devastation caused by floods). In human psychology the element governs the balance between fear or being exploited and the desire to dominate.