This example shows a scatter plot of the Iris dataset, encoding sepal length on the x-axis, petal length on the y-axis, and species using different D3 symbol shapes, with a legend for the shapes. The visualization loads data from a remote CSV file via `fetch` and `csvParse`, then uses `scaleLinear`, `scaleOrdinal`, and `symbol` to map data to positions and shapes. It builds the chart using `svg.call` with reusable modules for axes and legend, and updates dynamically through a state-based render loop.