This example demonstrates draggable circles on a light green background. Users can click and drag any of the six colored circles, and their positions update in real time. The visualization uses D3’s `drag` behavior to listen for drag events, updating the `x` and `y` properties of the corresponding data object. Circle positions are rendered with SVG `<circle>` elements, bound to the data via a data join and refreshed through state management. The code imports `select` and `drag` from the D3 library, with initial circle coordinates and radii defined in a hardcoded array.