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We've seen Google change its logo for big events before, but this time it chose to do something different.
If you search for "World Cup" in Google, you'll get a list of the upcoming World Cup games, but if you scroll to the bottom, you'll see that the other Google logo, stationed above the result page numbers, has changed to Goooooooal!
Given that Google recently granted users the option to create custom homepages, one has to wonder whether Google will lose its visual identity. Perhaps Google has become so big that it's synonymous with the concept of search, and thus the visuals don't play that big a part anymore?