Mother of Quizzing

• On January 15, 2001, X's first day of independent existence, It's Founder used the American flag as a temporary (placeholder) logo for "X". It was not intended to be permanent.

•  X's first true logo was an image that was originally submitted by Bjørn Smestad for the antecedent version's logo competition which took place in 2000. 

• It's founder thought it would be a much better logo than the flag, and it remained for the next eight months, until the end of 2001.

•  It continued to be used after this time on Special Pages, such as search results.The logo included a quote from Euclid and his Modern Rivals by Lewis Carroll; due to the fisheye effect, only part of the text can be read.

In one respect this book is an experiment, and may chance to prove a failure: I mean that I have not thought it necessary to maintain throughout the gravity of style which scientific writers usually affect, and which has somehow come to be regarded as an ‘inseparable accident’ of scientific teaching. I never could quite see the reasonableness of this immemorial law: subjects there are, no doubt, which are in their essence too serious to admit of any lightness of treatment – but I cannot recognize Geometry as one of them. Nevertheless it will, I trust, be found that I have permitted myself a glimpse of the comic side of things only at fitting seasons, when the tired reader might well crave a moment’s breathing-space, and not on any occasion where it could endanger the continuity of the line of argument.

• After some time it was replaced by a logo depicting a globe constructed of beveled puzzle pieces to symbolize the continuous construction and development of the project.

• Then it was merely modified into an image projected into a sphere, with a bump map applied to provide relief and simulate separate puzzle pieces.

Whose Logo am I talking about?

Answer (highlight to read) : Wikipedia