This interactive ThemeRiver chart visualizes median house prices over time, segmented by property type and bedroom count, using data from `ma_lga.csv`. The stacked streamgraph renders as SVG paths generated with `d3.area()` and `d3.curveBasis`, with colors from `d3.scaleOrdinal(d3.schemeTableau10)`. Users can click side labels to hide streams, hover to display a tooltip with date and price via `d3.pointer`, and click two streams to swap their stacking order, triggering an animated re-render with `d3.flatGroup` and `d3.minIndex`.