This visualization shows a grid of horizontal and vertical bars rendered as SVG rectangles, with a circular region left visibly unobscured at the center of the viewport. The code uses D3’s `select` and `range` functions to generate 100 bars in each orientation across the full window dimensions. Two SVG masks, created via D3’s `append` and `attr` methods, control visibility: one mask contains a white circle over a black background, while the other inverts this pattern. The bars display fine black stripes outside the circular mask area, producing a clean intersecting line pattern.