This dark-themed visualization breaks down a €12.99 music streaming subscription, tracing its distribution through a vertical Sankey diagram from the gross price through taxes and net revenue to artists, labels, publishers, and streaming platforms. The React application uses d3.v7 for layout calculations and renders custom SVG paths via a custom layout engine, with interactive hover effects and responsive resizing. Flow widths are scaled proportionally to monetary amounts, and each recipient is labeled with its percentage and euro value.