Five circles sit on a shared horizontal axis, each sized by a value from the current dataset. A button switches between two data arrays, triggering a one-second transition that repositions circle radii and x-coordinates. Using D3.js v6 with SVG and animation, the code employs data joins, `enter`/`exit` selections, and `transition` to update the visualization. An axis line and a title label (highlighting the active dataset) complete the chart, which renders entirely in the browser.