This example demonstrates the general update pattern in D3 with special cases for enter, update, and exit selections, using a bowl of fruit metaphor to show how data changes animate smoothly. Apples and lemons are rendered as circles with distinct colors and radii, positioned in a row inside a rectangular bowl. The code imports `scaleOrdinal` for color and radius mappings, uses `selection.merge` to handle updates, and applies `transition().duration(1000)` to animate radius changes. Data mutations—adding, removing, or altering fruit types—are triggered by `setTimeout` in the main script, with SVG elements and text labels updating accordingly.