Every O is a page
The pagination at the bottom of a results list is not a row of numbers, it is the logo with one O per available page. Ten pages, ten Os. The one you are on is underlined. Click any of the others and you go there.
Push the slider and watch the word run past the edge of the column. That is where every screenshot of gooooole and goooooooooogle comes from: a query with enough results behind it to stretch the name out of shape.
Phones killed it
Mobile loads more results as you scroll rather than splitting them into numbered pages, so the footer never gets a chance to draw the word. If you have only ever searched on a phone, there is a fair chance you have never once seen this.
The oldest joke still running
It predates the rotation tricks and it predates every game. The footer was built to echo the logo instead of listing numbers, and it survived redesign after redesign because nobody ever had a reason to remove it.
Same era as the layout at google in 1998. And the footer links this thing sits beside are the first casualties in google zerg rush.
