This visualization displays the classic Iris dataset using a parallel coordinate plot, with each of the four flower measurements (sepal length, sepal width, petal length, petal width) mapped to a vertical axis. Users can exchange the positions of any two axes via dropdown menus and a confirmation button, which triggers a redraw. The plot uses `d3.scaleLinear` for each dimension, `d3.scalePoint` for axis placement, and `d3.line()` to generate the colored polylines, with a legend identifying the three Iris species.