Google Gravity is an alternate home page that lets users play with the icons on the page. It still works as a search engine, but the results are not sorted in the traditional way. All of the icons have gravity and fall to the bottom of the browser.
With Google Gravity, the icons that fall to the bottom of the page can still be used. To access the page, go to Google.com, enter the phrase "Google Gravity" and click on the first result that appears, which is titled "Google Gravity - Mr. doob" as of August 2015. Google Gravity is often used to pull pranks on friends and family.