This piece re-creates a Sol LeWitt wall drawing as a responsive, browser-based SVG composition. It shows a grid of horizontal and vertical black bars that intersect only within a central circular region, creating a dynamic interplay of lines and void. The code uses the Document Object Model (DOM) API, specifically `createElementNS` and `setAttribute`, to construct SVG elements. It applies two SVG masks, `mask` and `mask2`, to limit the drawn rectangles to the circle’s area, with the horizontal bars masked by a white circle and the vertical bars by the inverse.