Responding to your mouse, the letters that make up the engine’s moniker explode into different colored circles. When you move your mouse away from the logo, the dots settle back into place.
Websites across the Internet are abuzz as they try to unlock a secret message that may be hidden within the circles, though whether or not one exists is open to debate. When asked if there was such a message, Google remained tight-lipped, saying only that the picture represented what search should be: "fast, fun, and interactive."
One popular theory is that the balls represent the new version of CSS – CSS3. Another states that it points to the Flash competitor, HTML5.