At Google, they not only make algorithms but they do have fun with their corporate logo occasionally. Over the years, Google has been changing logo with festivals or celebrities accordingly. Dennis Hwang has been designing the logos for Google since Larry page and Sergey hired him in 1998.
Today, Google has replaced the new logo by giving honor to work of German Physicist Scientist as he is considered to be the pioneer of electromagnetic waves.
German Scientist Hertz was the first person who proved that electromagnetic waves exist. This discovery helped later to develop the wireless telegraph, radio and television.
There are some trademark colors Google use to design logos like red, blue, yellow and green.
Here is a complete list of Google doodle. Looking forward to your comments with a doodle you love the most!