Worth remembering that these displays were small. The Radius or PERQ display was the same format as a piece of paper. It was "full page" only for 8.5x11, in the same way that 35mm camera sensors are "full frame". If you have a 21" or larger WUXGA display you already have 2 of these pages side by side and there aren't a lot of great reasons to run a display like that in portrait mode. Unless you are just dying to have realistic 11x17" pages, large portrait monitors are just an ergonomic problem.