This parallel coordinates chart visualizes the cost-of-living index across 74 cities, comparing six dimensions such as consumer price, rent, groceries, and local purchasing power. Grey background paths show all cities, while blue foreground paths highlight those selected via interactive brush filters on each axis. Built with d3.svg, d3.scale.ordinal, and d3.svg.brush, the visualization uses SVG rendering. User interaction toggles the display of foreground lines based on brush extents, providing dynamic focus on subsets of the data.