Elon Musk recently announced on Saturday night that Twitter will be rebranding, with the iconic bird logo being replaced.

Musk proposed the change to black in response to negative criticism of his changes to the site, and explained the logo change was to “embody the imperfections in us all that make us unique,” referencing the ancient Japanese philosophy of Wabi-sabi.

Musk appears to be fascinated with the letter X, which he has used to represent his idea of “the everything app.” He’s used it previously with his online bank X.com and his space exploration company SpaceX.

The proposed changes have drawn a wide range of reactions, with some users in support and others comparing it and concerned about a “New Coke” situation from the 1980s.

Twitter.com is still active, but the iconic bird logo has been replaced with an X throughout the site.