A generative art piece draws two sets of overlapping horizontal and vertical stripes through an SVG canvas, with the stripes visible only within circular masks that sit at the center of the viewport. One mask reveals a circle of dark-on-light stripes, while the second mask inverts the effect, creating a contrasting interplay of line orientation and color. The piece uses D3 v7’s `select`, `range`, and data joins to create 100 rectangles in each direction, applying SVG `<mask>` elements to control visibility.