This example demonstrates an interactive parallel coordinates plot of the Iris dataset, where each flower is represented as a polyline across four quantitative axes and one categorical species axis. Users can brush vertically along any axis to filter the dataset, with brushed intervals stored in component state and applied to recompute the displayed lines. The visualization animates filtered lines with opacity transitions using D3’s `transition` and `easeLinear`, while color encodes species via `scaleOrdinal` and `schemeCategory10`. Brushing and axes are rendered with `brushY` and `axisLeft`/`axisRight`, all managed through the d3-rosetta `one` helper.