This example demonstrates a simple D3.js visualization that creates a face shape using basic SVG circle elements. The code imports the `select` function from D3 v5 and appends a circle to an existing SVG, setting its radius and positioning it based on the SVG’s width and height attributes. The rendering relies on SVG within a React framework, with the circle’s center calculated relative to the fixed 960×500 viewport. No interactive or animated behavior is included beyond the static circle placement.