This visualization generates a grid of horizontal and vertical rectangles on an SVG canvas, with two masks that reveal or hide different symbol shapes across the grid. The project uses D3 v6 APIs including `select`, `range`, `symbols`, and `symbol` to render the masked patterns. The two masks, created via `renderMask`, alternate between white and black backgrounds with the opposite fill for the symbols, producing a moiré-like interplay between the line grid and the overlaid symbol clusters. The code runs on a React framework and uses raw SVG rendering with dynamic window dimensions.