A grid of horizontal and vertical black lines forms a full Sol LeWitt–style drawing, masked by overlapping diamond shapes to reveal alternating line orientations. Using D3 v7, the code creates 100 horizontal and 100 vertical rectangles on an SVG canvas, each masked via `d3.mask` with a large `symbol` path. The `renderMask` function appends SVG `<mask>` elements, using `select.append` and `attr` to set fill colors and transforms, producing the final geometric pattern.