A scatterplot matrix displays pairwise relationships among four numeric measurements of iris flowers, with points colored by variety using a categorical color scale. Built with D3 v7 and SVG, the visualization renders a grid of small multiples, each pairing two variables on linear scales. The code constructs scales and axes from column metadata, uses `d3.cross` to generate cell positions, and applies `d3.InternSet` to filter data by variety. Labels appear along the diagonal, and the d3-legend library is linked but legend rendering is not implemented in the visible script.