This example presents a generative, geometric composition inspired by Sol LeWitt’s wall drawings. It shows a grid of thin horizontal and vertical bars, with a circular region in the center where the bars are inverted in contrast: horizontal bars become visible inside the circle, while vertical bars are masked out there. The code constructs an SVG scene using the Document API (`createElementNS`), creating 100 horizontal and 100 vertical rectangles. Two SVG masks (`circle-mask` and `circle-mask-2`) define the circular interplay, with the first mask using a white circle on black to reveal the horizontal bars, and the second using a black circle on white to hide the vertical bars.