Two gears made of interlocking cogs rotate continuously in opposite directions, driven by a small JavaScript animation embedded in the SVG. The code uses `animateTransform` with a `rotate` type to spin each gear group around its computed center, with speeds of 16 and 10 seconds per revolution. The gears are drawn as path elements with a brown fill and stroke, scaled and translated into place. The example demonstrates fundamental SVG manipulation and animation without external libraries.