This example uses SVG and JavaScript to create a circular viewport that reveals a grid of horizontal and vertical lines. The visualization dynamically builds SVG elements, using masks to carve a circular hole in the background and to clip the vertical stripes inside the circle. The code creates a mask for the horizontal lines, which span the entire window width, and a second mask for the vertical lines, which fill the circle’s height. The result is an optical illusion of intersecting lines, produced entirely with procedural DOM manipulation and CSS styling.