This example visualizes the relationship between age, sleep duration, and sleep efficiency as a 3D scatter plot. Each point represents an individual, with yellow markers outlined in black, positioned along three axes that display the variables. The code loads CSV data from a GitHub gist using D3’s `d3.csv` function, then constructs the trace with Plotly’s `scatter3d` type and renders it via the `Plotly.newPlot` API. Axis titles and marker styling are configured through the layout and trace objects.