This example reproduces a Sol LeWitt-inspired drawing using D3.js within a React framework. It displays a grid of thin, evenly spaced horizontal and vertical bars rendered as SVG rectangles. Two circular masks are applied to these rectangle groups, causing the horizontal bars to fade out in the center and the vertical bars to fade out in a ring pattern, creating a subtle visual interplay. The code leverages D3's selection and range APIs to generate the marks efficiently.