The document discusses the differences between the Apple II personal computer launched in 1977 and the iPhone launched in 2007. The Apple II was "quintessentially generative technology" that was designed as an open platform for users to tinker with and develop new applications for. In contrast, the iPhone is a "sterile" device where all functionality is locked down and controlled by Apple, with no ability for users to modify or add new applications. While the openness of the Apple II led to many innovations, it also resulted in increasing problems like viruses and crashes over time. The iPhone represents a shift towards more closed and controlled devices.