One consequence of this was that user interface design became important. Many different user interfaces have been tried. This is the kind of interface provided by the Macintosh, Motif, Tk, and Microsoft Windows. It includes a mouse and a graphical display, with windows, menus, dialog boxes, scroll bars and so on. Just like the real thing When vendors advertise GUIs, they emphasize the graphics.
Graphics are, after all, what the user sees.
The real power of a GUI flows from the fact that objects on the screen behave like objects in the real world. You can move a window on the screen, just as you can move a piece of paper on your desk. Clicking in a button on the screen makes something happen, just like pushing a button in an elevator. Things on the screen only move if you move them, just like things in the real world. Most users consider GUIs to be simple and natural.