A three-dimensional scatter plot displays the relationship between height, weight, and age for individuals in a dataset. Each point represents a person, with size and opacity fixed, while colored markers show the three variables on the x, y, and z axes. The visualization uses Plotly’s `newPlot` function to render the `scatter3d` trace, and D3’s `d3.csv` method loads the data from a remote GitHub gist. The layout margin is set to zero for a clean, focused view.