A simple example i'm thinking would be to imagine a flat road with a ball on it at x_ball. (x_ball > 0). Starting at x=0 a machine begins raising the road, add

A simple example i'm thinking would be to imagine a flat road with a ball on it at x_ball. (x_ball > 0). Starting at x=0 a machine begins raising the road, adding gradually as it moves in the x-direction (creating a sloped road). Once the bulldozer raises the road under the ball it would roll towards x = 0. This machine moving in the positive x-direction is kind of "emanating outward" but it results in the ball rolling towards the origin.