Today is the 200th anniversary of the Brothers Grimm fairy tales. Google felt it would be a good idea to make an interactive Google logo, aka a Google Doodle, to honor the day.

The Doodle takes you through many of the different fairy tales as a slide show. You can click through the Doodle to see them all and then eventually, you are taken to a Google search result page for [Brothers Grimm] with of course the Knowledge Graph and Carousel featured.
They've been doing Doodles recently to make sure people see that feature.
Here is a video fo the Doodle in action:
For more on this, see Wikipedia.
Forum discussion at Google Web Search Help.

Comments:
Charlie Niehaus
12/20/2012 03:22 pm
Who was the artist for the Doodle? It looks a lot like Genndy Tartakovsky's work.
Martin Missfeldt
12/20/2012 04:41 pm
not sure, but it looks to me like the style of Willi Real.