This visualization creates a geometric pattern of overlapping horizontal and vertical rectangles, masked by two circular regions that reveal different sections of the grid. The code uses D3 selections and data joins to generate 100 thin rectangles in each direction across the full viewport. Two SVG masks control visibility: the first shows a white circle on black, while the second inverts this pattern, producing an interplay of solid and empty forms inspired by Sol LeWitt's minimalist wall drawings.