This example presents an interactive parallel coordinates visualization that lets users upload a CSV file and explore multivariate datasets. It renders data as polylines across multiple vertical axes, with brushing to filter values, axis reordering via drag, and axis inversion on click. The visualization combines three stacked canvases for foreground, background, and highlighted lines with a D3.js SVG overlay for axes and labels. It uses `d3.csv.parse` for file parsing and `d3.svg.brush` for interactive filtering, with sample datasets included for cars, earthquakes, and nutrient compositions.