A blank canvas is presented as a full-screen, rounded rectangle rendered in SVG, filling the entire viewport with a clean, empty surface. The visualization uses D3.js v5 via the `select` method to create and size the `rect` element dynamically based on the browser window's dimensions. No data is loaded or displayed, and the code simply sets the SVG's width and height attributes before appending the rectangle. The result is a minimal, static composition that foregrounds the canvas itself as the subject.