In 2005 I got some animation software. A standard exercise for beginning animators, people said, is to create a looping sequence of a ball bouncing in place. An alternative image came to me:
That is, what if the thing went up and came down, and then — thunk! — just sat there until it hurled itself upward again? And anyway what sort of thing would do that?
A rock. A jumping rock.
But a rock is purposeful; it exerts itself for a reason. So I added horizontal motion. This movie is an answer to the question, “If a rock wants to get from A to B, what will it do?”