This is a generative SVG reproduction of Sol LeWitt’s wall drawing, shown vertically across the full browser viewport. A circular mask, defined via SVG `<mask>` and a white circle, reveals only the central region of a grid of 100 horizontal and 100 vertical black rects. The horizontal rects are layered beneath the vertical ones and clipped by the mask, creating a contrasting circular window. The piece uses raw JavaScript DOM manipulation with `document.createElementNS` to build the SVG elements dynamically, with no external libraries.