Google reflects its mirror perspective of the normal search engine. Which means everything, starting from the domain name and to the end of Google Search, is horizontally flipped. I know it’s kinda stupid thought, but it has its security benefits. You know, not everyone can read flipped version that quickly, so it adds an extra step to see through a mirror. And so on, as we plant more ideas to it. 😛
Here are a couple of more reflections below:
It’s definitely not April Fool Prank. You can give it a try over this little link.