Here is the first complicating fact about the Jobs visit. In the legend of Xerox PARC, Jobs stole the personal computer from Xerox. But the striking thing about Jobs's instructions to Hovey is that he didn't want to reproduce what he saw at PARC. "You know, there were disputes around the number of buttons--three buttons, two buttons, one-button mouse," Hovey went on. "The mouse at Xerox had three buttons. But we came around to the fact that learning to mouse is a feat in and of itself, and to make it as simple as possible, with just one button, was pretty important." [...]
If you lined up Engelbart's mouse, Xerox's mouse, and Apple's mouse, you would not see the serial reproduction of an object. You would see the evolution of a concept.
The same is true of the graphical user interface that so captured Jobs's imagination. Xerox PARC's innovation had been to replace the traditional computer command line with onscreen icons. But when you clicked on an icon you got a pop-up menu: this was the intermediary between the user's intention and the computer's response. Jobs's software team took the graphical interface a giant step further. It emphasized "direct manipulation." If you wanted to make a window bigger, you just pulled on its corner and made it bigger; if you wanted to move a window across the screen, you just grabbed it and moved it. The Apple designers also invented the menu bar, the pull-down menu, and the trash can--all features that radically simplified the original Xerox PARC idea.
The difference between direct and indirect manipulation--between three buttons and one button, three hundred dollars and fifteen dollars, and a roller ball supported by ball bearings and a free-rolling ball--is not trivial. It is the difference between something intended for experts, which is what Xerox PARC had in mind, and something that's appropriate for a mass audience, which is what Apple had in mind. PARC was building a personal computer. Apple wanted to build a popular computer.