This example demonstrates the general update pattern for transitions in D3.js v5. A row of apples and lemons sits in a bowl, with items being removed or changed over time via timed JavaScript callbacks. The visualization shows how D3's `.transition().duration(1000)` animates changes to circle radius and fill color, while the `.merge()` and `.exit().remove()` methods handle entering, updating, and exiting elements. The code uses D3's `scaleOrdinal` for color and radius mapping, and `selectAll`/`enter()`/`exit()` to manage SVG groups.