This is supposed to move without clicking if your device has an accelerometer. Can someone try this and report?Clicking on the google logo bought me to a google search of Jules Verne, the French author of Twenty Thousand Leagues Under the Sea (1870) and Around the World in Eighty Days (1873) according to wikipedia.
From the official Google Blog, "Today's doodle, celebrating Verne's 183rd birthday, tries to capture that sense of adventure and exploration. Using CSS3 (and with help from our resident tech wizards Marcin Wichary and Kris Hom), the doodle enables anyone to navigate the Nautilus down (nearly) 20,000 leagues with the simple pull of a lever. And for those using devices with built-in accelerometers and the latest versions of Google Chrome or Firefox, it's even simpler—just tilt your device in the direction you want to explore and the Nautilus will follow."