This example generates an interactive Sol LeWitt-inspired drawing using only native JavaScript and SVG APIs, without external libraries. It shows a grid of thin horizontal and vertical lines across the full browser viewport, masked by two circles at the center. The first mask reveals horizontal bars within a dark circle, while the second mask inverts the effect for vertical bars in a contrasting ring, creating a crosshatched circular pattern that stands out against the plain background. The code creates elements dynamically via `document.createElementNS` and applies masks (`circle-mask`, `circle-mask-2`) to clip the repeated rectangles.