In the early 1990s, Pink's graphical user interface (GUI) is based on a "faux" 3D motif of isometric icons, beveled edges, non-rectangular windows, and drop shadows. One designer said "The large UI team included interaction and visual designers, and usability specialists." That essential visual design language would be an influence for several years into Copland, Mac OS 8, and CommonPoint. Magazines throughout the early 1990s showed various mock-ups of what Pink could look like. The People, Places, and Things metaphor extends beyond the traditional desktop metaphor and provides the user with GUI tools to easily drag documents between people and things, such as fax machines and printers. The system had a component-based document model that is similar to what would become OpenDoc. In mid-1991, Apple CEO John Sculley bragged that Apple had written 1.5 million lines of code for Pink. An IBM engineer described the first impression of this sophisticated prototype in 1991: