Yahoo! today unveiled a brand new logo — the first change to the company’s logo in 18 years. The logo, which remains purple and all caps, is now sleeker and more modern than the outgoing logo and does away with straight lines. Yahoo has also created an alternate logo which uses a white font set against a purple backdrop. Mathematical consistency played a big part in determining the exact proportions of the logo and you can see just how in the below video released by Yahoo!. Check it out and let us know what you think of the new logo.