This block-like composition reproduces Sol LeWitt’s geometric art using D3 v3 and SVG rendering. It displays a grid of horizontal and vertical stripes that intersect, with circular masks revealing overlapping patterns: one mask exposes the vertical lines, another hides sections of the horizontal ones. The code uses `d3.select`, `d3.range`, and data joins to generate 100 rectangles in each direction, applying `mask` attributes to create the visual interplay. The artwork fills the browser window, adapting its dimensions to the viewport.