This visualization shows the classic Iris dataset as a scatter plot of sepal length against petal length, with points colored and shaped by species using D3 v7. The code employs `scaleLinear` for axes, `scaleOrdinal` with `symbolsFill` to map species to distinct shapes, and custom legend and axis modules. Data is loaded from a CSV via `csvParse` and rendered with `d3.symbol` paths sized at 200 pixels. The plot uses a viewport-sized SVG with margins, updating interactively based on window dimensions.