Rows of fruit circles animate between states as apples are eaten and one apple transforms into a lemon. The example demonstrates data joins with a key function, using transitions to smoothly interpolate circle radii and x positions over one second. It builds on the `fruitBowl` module, which applies ordinal color and radius scales, while `setTimeout` triggers state changes every second. Rendering uses SVG circles, with D3 v5's selection, data, and transition APIs driving the animation.