Six colored circles of varying radii animate onto a light green canvas, each growing from zero to its target size at a staggered pace. The circles then reposition themselves to new coordinates with a quicker, linear easing transition, while any removed circles shrink back to nothing. Built with D3 v7, the example demonstrates the `transition` API, using `selection.join` to handle enter, update, and exit states, with explicit `duration` and `easeLinear` settings controlling the two distinct animation speeds.