delay from a mark's motion function to grow each bar from the baseline in turn, with April and the target line on their own timing.motion.transition between a spring and a tween to see how two lines settle when their values change or reverse mid-flight.key so reordered, added and removed periods move, enter and exit, with spring stiffness and damping you can tune.motion on an axis, its ticks and its tick labels so the guides animate on their own timing while the bars spring to new values.transition to each focus states entry and to the crosshair so hovered points, series and the cursor glide between days.createMark as a shape of the same point count so a spring can morph it between bars, a rose, a donut and bubbles.