Google had this doodle today as a hom(p)age to Jules Verne. By moving the joystick on the right, the image ‘behind’ the Google logo moves and takes you on an atmospheric underwater journey (reference to 20,000 Leagues Under the Sea).
I was curious enough to find how the guys created this. So, turns out its not one background image. There are four overlapping images, moving at different speeds according to how you move the joystick. Its HTML5, and the effect is pretty cool!
Here’s the combined image (check out the Google logo at the seabed :)