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Clearlooks is a theme forGTK, the mainwidget toolkit used by theGNOME desktop environment. It is based onRed Hat'sBluecurve theme. It was the default theme for GNOME since version 2.12 until GNOME 3 when it was replaced byAdwaita.[1] Many users have contributed themes that have changed the colors and some visual effects, leading to many derivative themes.
The creators of the Clearlooks GTK+ theme were Richard Stellingwerff and Daniel Borgmann; however, since 2005 the theme has been developed by GNOME, and current developers are Andrea Cimitan and Benjamin Berg.
The current version of Clearlooks usescairo as a backend.[2] Older releases just useGDK to draw the widgets.
Qt, versions 4.2 to 4.4, use a port of Clearlooks calledCleanlooks to better integrate with GTK applications.[3]


Since the departure of the GNOME Project from the development of GNOME 2 and GTK+ 2, developers forked GNOME 2 and created theMATE desktop environment. It still contains almost all GNOME 2 features and themes. The Clearlooks theme is calledTraditionalOK in MATE.Furthermore, a user by the name of jpfleury on Gnome-Look has recreated Clearlooks for GTK+ 3, called Clearlooks-Phenix.[4]