I never knew or had forgotten the Throne Room was a Harrison Ellenshaw matte. For years this has been called a cardboard cutout.
Matte painting before digital is kind of a lost art, the best kinds were ones people thought were a normal part of the image and blend in, don’t draw attention to themselves.
Like warehouse in Raiders at area 51.
Ben Kenobi suspended on a platform hundreds of feet above the bottomless depths of the death star.
The Genesis Cave matte painting in Star Trek II.