Wu-Wei is the Taoist expression for the power of positive not-doing. It is the action in non-action, the knowing in not-knowing, the something in nothing, the doing in not-doing. Wu-Wei is following the way of the water, the way of the wind. It is the not absence of action, but it is the absence of trying. Wind is never still, but it has no intention. Water ever seeks its own level, but not on purpose.

[from www.foolquest.com/zen.htm]