Parallel Coordinates
A parallel coordinates plot displays the Iris dataset, with each flower represented as a polyline crossing vertical axes for sepal length, sepal width, petal length, and petal width. Gray background lines show all data points, while steel-blue foreground lines highlight the focused subset. Users can drag axes to reorder dimensions and brush along an axis to filter displayed lines. The visualization uses d3.svg.line, d3.svg.axis, d3.behavior.drag, and d3.svg.brush, with SVG rendering and animated transitions during axis reordering.