This piece reproduces a Sol LeWitt wall drawing using SVG. It displays a grid of horizontal and vertical bars, but only within two circular regions at the center of the canvas. Outside these circles, the rectangular elements are hidden. The code creates two SVG masks to control the visibility: the first mask reveals a white circle over a black background for the horizontal bars, while the second mask uses a black circle on white to show the vertical bars. All elements are generated procedurally through the SVG API in a single HTML file.