This example reproduces a Sol LeWitt wall drawing using two SVG masks to create a central circular region where intersecting horizontal and vertical lines alternate between foreground and background. The code builds the visualization with plain JavaScript and SVG DOM manipulation, using the `mask` element with black and white `rect` and `circle` shapes to control visibility. Each of the 100 lines is drawn as a thin `rect` element, with horizontal lines clipped by the first mask and vertical lines clipped by the second, producing a geometric pattern that shifts contrast inside and outside the circle.