This example uses D3.js to draw a sandwich centered within an SVG canvas. The visualization is constructed programmatically by appending basic SVG shapes—rectangles, a path, and ellipses—to represent the bread, lettuce, tomato slices, and cheese. The code directly manipulates the SVG DOM using D3 selection and append methods, with hardcoded positions and colors. It demonstrates fundamental D3 v7 syntax for building static graphics, including applying drop-shadow filters to the bread elements for a subtle visual effect.