This example demonstrates the general update pattern in D3, showing how circles representing fruit change over time as data is modified. The visualization renders five apples as red circles using `d3.scaleOrdinal` for both color and radius, then removes one fruit after a second and changes another from apple to lemon after two seconds. The code uses D3's data join with `selection.enter`, `selection.merge`, and `selection.exit` to handle updating, entering, and exiting SVG circle elements.