Oberon Object Tiler

Unlike the overlapping "cascade" windows of Mac or Windows, the Oberon Object Tiler used a strict algorithm. The screen was divided into a set of rectangular frames, each containing a viewer—a window that displayed a text file, a directory listing, a piece of source code, or a graphical object. These frames were arranged to fill the entire screen without any empty background or occluded areas. A user could split a frame horizontally or vertically, creating a new tile. Existing frames would automatically resize and reposition to accommodate the change, maintaining a perfect, gap-free layout.