Search engine giant Google celebrates holidays, anniversaries, and the lives of famous artists, pioneers, and scientists by changing its logo with 'surprising, and sometimes spontaneous changes'.
Here The Drum takes a look back at some of 2013's best ones, including the 150th anniversary of the London Underground, St Patrick's Day, Thanksgiving and the 50th anniversary of Doctor Who.
9 January 2013: 150th anniversary of the London Underground
21 January 2013: Martin Luther King Day
14 February 2013: Valentine's Day
Google celebrated Valentine's Day and the creator of the Ferris Wheel, George Ferris' 154th birthday in one fell swoop with this interactive doodle.
25 April 2013: Ella Fitzgerald 96th birthday
8 May 2013: Saul Bass' 93rd birthday
30 June 2013: Herta Heuwer's 90th birthday
14 July: Ingmar Bergman's 95th birthday
27 September 2013: Google's 15th anniversary
Google celebrated its own birthday with a piñata doodle game.
23 November: 50th anniversary of Doctor Who
28 November 2013: Thanksgiving
2 December 2013: Carlos Merida's 122nd birthday
21 December 2013: 100th anniversary of the crossword