This example demonstrates staggered transitions for a set of ten circles, which move horizontally between two alternating column configurations when the “Update data” button is clicked. Each circle transitions its `cx` attribute with a sequential delay of 100 milliseconds, creating a cascading wave effect. The visualization uses D3 v7’s data join (`join('circle')`) and the `transition().delay()` API, with SVG rendering and opacity styling defined in CSS. The underlying data array is regenerated on each click to flip the target x-coordinates between left and right sides.