This example demonstrates five fundamental D3 marks and encoding channels using a small array of numbers. It shows circles positioned along the x-axis and y-axis, circles scaled by area, rectangles representing length, and symbols displaying different shapes. The visualization uses D3 v7 with the `select`, `symbol`, and `symbolsFill` APIs to bind data and generate SVG elements. The data is a simple fixed set of integers, rendered as multiple separate SVG canvases, each focusing on a distinct mark and channel combination.