This bar chart displays multiple series of smooth, generated data using stacked and grouped layouts. Users toggle between layouts and toggle individual series on and off via custom radio buttons. The visualization uses D3 v6 with SVG rendering and transitions to animate bar positions and heights. Data comes from a custom `bumps` function, and the chart uses `d3.stack`, `d3.scaleBand`, and `d3.scaleLinear` for layout and scaling.