Google has implemented some features to spice up its interface. One of the tricks it added was "do a barrel roll." This feature makes the screen do a barrel roll every time you search up a topic.
Another one is Google Pacman. This allows you to play pacman on the main Google screen. This is a fun way to pass the time google has to offer.
Google gravity is a google that makes every thing on the page has gravity. When you get to the page everything falls down and every thing you search will fall.