 In two or three dimensions one can visualize the vector field as giving rise to a flow on "S".If we drop a particle into this flow at a point "p" it will move along the curve γ"p" in the flow depending on the initial point "p".If "p" is a stationary point of "V" (i.e., the vector field is equal to the zero vector at the point "p"), then the particle will remain at "p".