To the uninitiated, the concept is simple. By navigating to the Google homepage and searching for "google gravity" (or sometimes "google gravity tornado" via specific Easter egg repositories like Mr. Doob), the familiar, rigid interface of the search giant is subjected to a simulated tornado.
The iteration took this a step further. Instead of simple gravity pulling elements down, the "Tornado" mode (often accessed through specific third-party mirrors or via the "Google Gravity" search triggers) introduced wind and rotational physics. google gravity tornado