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.