This example generates a dynamic, Sol LeWitt-inspired abstract composition using an SVG mask API. Two masks invert visibility: the first reveals a circle of horizontal stripes, while the second displays vertical stripes within a donut-shaped region. The code uses pure JavaScript and the Document Object Model (DOM) to create SVG elements, including `<mask>`, `<circle>`, and `<rect>` tags, without any external libraries. Rendering relies on the viewport’s width and height to size the artwork, which appears as an interplay of masked rectangular stripes.