This example presents two scatter plots of the Penguins dataset, one comparing sepal length to sepal width and another comparing bill length to flipper length. The code uses D3's `scaleLinear`, `extent`, and axis components imported from `@curran/axis-labels` to render the plots. It leverages D3's `.join` operator for efficient incremental updates of SVG circles, with adjustable radius and opacity. The visualization is driven by the `viz` function, which takes column selectors and margin configuration as parameters, allowing simple reuse for multiple attribute pairs.