This example displays car manufacturer sales data for the first six months of the year as a 3D bar graph, with each manufacturer grouped into monthly bars. The visualization uses the `d3.x3d.chart.barChartMultiSeries()` API from the d3-x3d library, combined with D3 v5 for data parsing and scaling, and X3DOM for rendering the 3D scene. Data is loaded asynchronously from a CSV file using `d3.csv`, where each row is parsed into a series of monthly values, then bound to the chart via `datum()` and `call()`.