This example generates a striped grid of horizontal and vertical rectangles, overlaid with two complementary masks that reveal distinct D3 symbol shapes in the negative space. Built with React and rendered as SVG, it uses d3.select, d3.range, d3.symbol, and d3.symbols to place the shapes. The first mask shows the symbols in white on black, while the second inverts the pattern, creating an interlocking visual effect across the full viewport.