Google Doodles are used to commemorate special events or people and briefly replace its familiar logo with a different one which is hot linked to search results usually topped by Wikipedia entries.
According to a post on Google product forums, a user, Bhuddika Nuwan has requested the google team to place a google doodle on the island's independence day on its homepage.
Sri Lanka's independence day marks the end of British colonial rule on February 04, 1948 and the start of a path to self-determination.