This example displays a scatterplot matrix of the Iris dataset, showing pairwise relationships between sepal length, sepal width, petal length, and petal width, with points colored by species. The visualization uses D3 v5 to render SVG circles and axes, and implements linked brushing through `d3.svg.brush`. Dragging a brush over any cell highlights matching points across all other cells, while a gray overlay indicates unselected data. The code loads the data via `d3.csv` and maps each trait’s domain to linear scales.