It is the fourth visible user interface of the personal computer era.
The first was character mode. MS-DOS. The second was the GUI, graphical user interface. Macintosh and Windows. The third was touch. iPhone and Android. The fourth is spatial computing.
At each introduction of a new user interface some companies either went away or became dramatically less important. When GUI’s came along Borland and Wordperfect, both companies bet on the older character mode and promptly went away.
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