This example demonstrates a hand-drawn unit floor plan for an archaeology site, displayed within a bordered 400x400 grid overlaid on a larger SVG canvas. The visualization shows a basic outline of an excavation unit, including a grid of gray lines that subdivide the space into 40-pixel increments and four shaded corner balks that indicate unexcavated areas. The code uses raw SVG elements such as `<rect>`, `<line>`, and `<path>` to construct the plan, with hard-coded coordinates for each shape. The rendering is done entirely through declarative SVG markup, with no JavaScript libraries or external data sources involved.