Seven colored circles, each 15 pixels in radius, rest in a horizontal line at the bottom left of a mint-green canvas. Hovering over any circle smoothly animates it into an evenly spaced orbit around the screen’s center, using an ease transition over one second; hovering again returns it to its original spot. The example demonstrates D3 v7’s `select().join()` for SVG element creation and stable keyed data binding, alongside `on('mouseenter')` event handling and the `transition().attr()` API for position tweening. All seven circles—red through violet—exist in a fixed dataset.