This example demonstrates basic D3.js v7 shape generation and data binding on an SVG canvas. It renders a small bar chart from an array of four numbers, with black rectangles positioned through the enter selection pattern, and places a large red symbol from `d3.symbol` at the center of the viewport. The code uses `d3.select`, `d3.range`, `d3.symbols`, and `d3.symbol` to draw the geometric forms, while sizing the visualization to match the full browser window dimensions.