A fork of circles with D3 shows a static bar chart of billing amounts by customer name, rendered as SVG rectangles. The chart uses D3 v7 scales and axes to map data, with bars colored steelblue that turn brown on hover. The code sets up a linear y-scale and band x-scale, then appends axes and rects to the SVG. The sample data appears truncated, and the visualization relies on `d3.scaleBand` and `d3.scaleLinear` for layout.