April Fool’s Joke or not, it seems that Google has gone 3D (as in need to wear a red-green glass to see it 3D) with its Books and Street Views.
Mouseover image to see the 3D version (with red and green offset images). Click on image to see a larger version.
See the cute lego head at the top right corner (just below the navigation icons) with cool 3D glasses up on its head? Click it to see the 3D version of the street view.
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