And if you know a little bit more about the history, Apple's GIU is a direct ripoff of the paperless office developed by Xerox PARC.
Xerox had no idea what they had when they invented the GUI and mouse, and gave it all away.
Apple actually paid for the visit with a lot of Apple shares. The mouse was invented by Douglas Engelbart at Stanford; however, PARC did improve on Engelbart's design with the ball-based mouse (and their GUI was also an improvement on Engelbart's earlier work).