This fork demonstrates the transition from a scatter plot to a pie chart visualization of the Iris dataset. Renderered in SVG, the piece loads CSV data via `d3.csv`, parses numeric columns, and uses a custom pieChart function to encode petal length by angular size, colored by species. The centered pie chart includes a legend populated via D3 data joins, and axis labels for petal and sepal length remain vestigial from the original scatter plot code.