This example shows a geometric composition of concentric rectangles that shrink toward the center of an SVG canvas, with a visible mask creating a hollow square hole in the middle. The rectangles are generated in a JavaScript while loop, using the SVG DOM API to create mask elements and rect elements dynamically. The code sets stroke widths and border increments to space each rectangle, while the mask, defined with white and black fill regions, determines which parts of the rectangles remain visible. The result is a minimalist, grid-like pattern inspired by Sol LeWitt, rendered entirely in SVG.