This example visualizes country population data with a bar chart that uses an isometric 3D cube rendering style, generated from a CSV file loaded via `d3.csv`. The chart displays horizontal bars scaled by `d3.scaleLinear` and positioned with `d3.scaleBand`, while the 3D effect is created using the `d3-3d` library to draw cubes with height proportional to population values. The rendering includes interactive drag rotation, implemented with D3 drag events, and per-cube color mapping via `d3.scaleOrdinal`.