"Triumph of the Nerds Part III: Great Artists Steal" is a documental created in 1996 which premise is exactly the creation of the GUI and how this change the world of the computation forever. Now, the documental is mainly about the creation of the concept of GUI which originally was first created for Xerox and later was a concept that Apple took (by inspiration of Xerox) in order to implement a GUI in their inventions, being the Apple Macintosh the best invention that used the GUI created by Apple in that time, telling us that Apple had as "killer software" in that time, a software created by Adobe which gave to the company fame of create hardware dedicated for the computer artists, but that unfortunately wasn't enough to ensure the domain of the competition of Apple in the 90's because all of this was affected by the creation of Windows, the most popular GUI in the history of the computation, which was created for being used in the IBM computers, the most popular computers in the 90's, which turned Microsoft in the powerful company that nowadays is and the strongest competitor for Apple till the date.
Now, the GUI was really the difference that change the world of the computers for good and made that the computers were the great success that are nowadays, because nowadays all the computer systems from PCs to tablets use GUI's for everything doing possible that the use of the applications be more friendly and intuitive to use for anyone.
With this documental we can see that it doesn't matter if you are the first one to have a potential idea just like XEROX did, because if you don't take advantage of it, you will lose against other rivals that see your idea or also have the idea and do take advantage of it just like Apple or Microsoft.
If you are interested in watching this vides: here's the link: Triumph of the Nerds Part III: Great Artists Steal.