Google Gravity was a special doodle that replaced the traditional Google logo on May 20, 2010. The doodle featured the Google logo, but with a twist: each letter was represented by a small, colorful, slime-like object that seemed to defy gravity. When users visited the Google homepage, they were greeted by a whimsical and interactive animation that made it look like the letters were floating in mid-air, bouncing off each other, and reacting to the user's mouse movements.