In addition to its eponymous search engine, Google (which recently celebrated its twentieth birthday) is well-known for its doodles that frequently replace the company's official logo on its homepage. These doodles, which Google describes as "the fun, surprising, and sometimes spontaneous changes that are made to the Google logo" and whose first occurrence actually predates the incorporation of Google itself, are often used to visually celebrate holidays, commemorate anniversaries of historical events, and honor the lives of scientists, artists, and historical figures. The Google Doodle Archive allows interested readers to explore the more than 2,000 doodles that the company has created thus far. As of this writing, these include Google's 20-year doodle retrospective, a doodle from "this day in history," and a link to view all of Google's interactive doodles, as well as their full archive of doodles in reverse chronological order. Originally created by Google's webmaster Dennis Hwang (who was an intern at the time), the doodles today are generally the work of a team of illustrators and engineers.