This example animates a small multi-line stock chart, showing three fictional symbols (AIC, Mada, VIZ) over time. The animation initially draws each line progressively, then transitions into a “horizon” view, where each series is stacked and colored to show its magnitude and direction. The code uses d3.csv to load the data, d3.nest to group by symbol, and d3.svg.line and d3.svg.area to define the shapes. Animated transitions are driven by d3.timer and the transition method, with SVG elements for rendering.