This visualization uses a square-binned density plot to show the relationship between Airbnb listing person capacity and price in London, with color intensity (blue to yellow) representing the density of listings at each price level for each capacity. Red horizontal lines indicate the average price for each capacity group. The chart is rendered using D3.js v7 within a React 19 application, employing `scaleLog` for the price axis, `scaleBand` for capacity, and a custom pixel-by-pixel density calculation with `interpolateRgb` for the color scale.