Eight planetary gears encircle a central pivot, each spinning at its own rate, creating a rotating frame of reference that distorts perceived motion. The animation, rendered as SVG paths via `d3.svg` and driven by `d3.timer`, updates each gear's rotation by dividing elapsed time by its radius. A subtle spatial skew and changing border ownership emerge as the eye fixates on the center, while the green background shifts the figure-ground interpretation. The demo builds on Steve Haroz’s original illusion, using only D3 v4 and standard SVG transforms.