This example generates an SVG visualization inspired by Sol LeWitt’s geometric wall drawings. It shows a grid of alternating horizontal and vertical black stripes that are visible only within a circular mask centered on the screen. The code uses the Document Object Model’s `createElementNS` method to construct SVG elements, including a mask containing a circle, and appends 48 horizontal and 48 vertical rectangles. The rectangles are clipped by the mask via the `url(#circle-mask)` reference, producing a circular cutout effect against a full-window backdrop.