So that's a little bit counterintuitive, because we're talking about our position in the left-right dimension, and here you're seeing it start off in the vertical dimension. But you see the same thing. At time t equals one, our position has gone down to three, then it goes down further. At time equals two, our position is down to one. And then we switch direction, and then over the next, if we say that time is in seconds, over the next second, we get back to five. Now, an interesting thing to think about in the context of calculus is, well, what is our velocity at any point in time? And velocity, as you might remember, is the derivative of position.