This example reproduces a Sol LeWitt-style wall drawing using only the native Web API, generating a grid of horizontal and vertical bars contained within a circular boundary. The visualization shows a large central circle filled with evenly spaced black horizontal strips, while the area outside the circle displays similarly spaced vertical strips against a white background. The code builds an SVG scene, using two SVG `mask` elements to selectively reveal the horizontal and vertical rectangles. It constructs each rectangle individually in JavaScript loops, with the masks controlling which bars appear inside or outside the circle based on their fill colors.