What are 'force vectors"?

From the Pulsonix

"Force Vector The force vector is an visible indicator that shows you how far, and in which direction, to move the dynamic items to their 'optimal' position.

This position is where the nets attached to the moving items would be balanced to reduce overall connection length and avoid very long and very short connections. In other words to place the items where they are not too close nor too far from other stationary items on the same nets. If you consider the connections from the moving items to the stationary ones as springs, the optimal position is where the moving items would come to rest if you 'let go'."

Leon