This example demonstrates a reusable scatter plot that visualizes the Iris dataset, with points colored by species and rendered as different D3 symbols. The chart displays petal width on the x-axis and sepal length on the y-axis initially, then cycles through all four numeric columns every 15 seconds using `setInterval`. Built with D3 v3 APIs including `scaleLinear`, `axisLeft`, `axisBottom`, `scaleOrdinal`, and `symbol`, the SVG visualization updates dynamically by calling the chart function again with new accessor functions.