A striped grid of thin vertical and horizontal lines is drawn across the full window, with overlapping circular masks revealing or hiding portions of the pattern. The visualization uses d3.range to generate line positions and d3.symbol with a square symbol to create the mask shapes. By applying two masks—one inverted and one not—the grid lines appear in a layered, cross-shaped intersection. The rendering is done in SVG, with line spacing determined by the window width.