This example visualizes the classic Iris flower dataset, plotting sepal length and width measurements as colored circles on an SVG canvas. Each circle represents a single flower sample, with distinct colors corresponding to the three species: setosa, versicolor, and virginica. The visualization uses D3 v3 to load the CSV data with `d3.csv`, and it includes interactive mouseover events that change a circle’s fill color and display a temporary tooltip showing the species name. However, the primary chart axes and scales defined at the top are not actually connected to the plotted data, leaving the visualization as a raw, unlabeled scatterplot.