This example visualizes a historical dataset of individuals’ birth and death dates as an interactive timeline. It renders circles for each person along a horizontal time axis, with a filtered subset highlighted in a different color. The visualization uses D3 v7 to create SVG elements, including year markers and draggable controller points that adjust the selected range. It incorporates custom curve logic for smooth path interpolation and applies color coding to distinguish between the full dataset and the currently selected time window.