One thing that UNIX users have that Mac and Windows users don’t: it’s generally quite easy to change their window manager theme – and to write/draw their own.

Window decorations – a frame, a titlebar, some buttons – are handled by the X11 window manager, which is itself a replaceable part. Window managers range from minimalist exercises in reductionism through gaudy feature-festivals like Enlightenment, the original perpetrator of shaped, translucent and transparent effects. But…