Five apples appear in a row on an SVG canvas, each rendered as a filled circle. Hovering over a fruit highlights it with a black stroke, and moving the mouse away removes the highlight. The example uses d3-selection’s data join and transitions to animate the circles’ entry, exit, and size changes as apples are eaten or replaced by a lemon. A color scale maps fruit types to red or yellow, while a radius scale distinguishes apple and lemon sizes.