A grid of horizontal and vertical rectangles overlays the full viewport, with SVG masks revealing a circular window at the center. The piece reproduces Sol LeWitt's geometric wall drawing style using D3's `select`, `range`, and `join` methods to generate 100 rects in each orientation. Mask `circle-mask` exposes the horizontal bars inside a white circle, while `circle-mask-2` inverts the effect, showing the vertical bars outside the same radius. The composition renders dynamically to the browser's current dimensions using an SVG container.