Three fruit categories—apple, lemon, and watermelon—are displayed as colored, sized circles that shift horizontally with animated transitions. Using `d3.scaleOrdinal`, the example maps each fruit domain to distinct size (`r`), fill color, and gap values that adjust the spacing between circles during the render. The SVG groups animate their `transform` position over one second via `transition().duration()`, while labels appear above each circle with matching offsets. The code imports from D3 v7 and relies on a custom render function to coordinate the ordinal scales and dynamic positioning.