This fork of a Sol LeWitt reproduction uses D3 to render geometric SVG patterns defined by masking operations. The visualization shows two overlapping grid systems—horizontal and vertical bands—that are selectively revealed through circular masks, creating concentric visual interference. The code constructs SVG elements directly via `document.createElementNS`, applying masks like `circle-mask` and `circle-mask-2` with fill-based opacity to shape the output. Each of the one hundred rectangles in both orientations is appended to the SVG, with D3 managing the page dimensions and DOM integration within an HTML5 environment.