How to turn you google upside down

At my 'nothing-to-do' weeks at Jatinangor, I've been randomly searching for something intereresting in the net, and i found this one. By doing this step, u can turn u're google upside down! Relax it's not permanent, its just for fun purpose only. So!  First, when u open a google at the net, i believe u notice that were a sign beside the 'google search', and that was 'I'm feeling lucky'.
And that was not ordinary button to pushed, not after u found out how to use it.
I already found some of the 'code' that will get triggered when u typed it down at the search space, and then pressing the sign 'i'm feeling lucky'

So! This is the step

1. Open a google tab, it doesn't matter whatever browser u're using right now. U'll see this kind of page when u first open the website

Normal Page

2. Now, try to write Google Gravity at the search space, and the click the 'I'm Feeling Lucky' sign.

Voila! U'll got this one

Google Gravity

Or try the other, i've found a few other codes that maybe interest you, try :

Google Sphere

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Google Easter Eggs

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Google Hacker

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Google Pacman

    
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Google Gothic

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Google Loco

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Google Mirror

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And hey! If u found other codes that might be interesting, let me know okay, cheers guys