What I get from the reading is that "reality" is shaped by medium. That is, what we perceive as reality changes when we choose what medium we receive information in. The danger of this is that we are less aware of what reality actually is. In the examples about the robot and endoscope, the viewer can only see what is on their camera. They might be missing something that is off-camera.
I don't understand the part about Shirley, where it says, "there is eventually a rupture. If the story goes on long enough, Shirley is certain to come upon a television, a movie screen, or even a desktop computer represented inside the virtual reality, an acknowledgement that media are among the objects that make up our world (216)." It seems like they are saying that virtual reality doesn't need media, but I don't see why that would be true if virtual reality is supposed to mimic reality. Why can't a virtual reality have virtual media?
It is like saying that if I am reading a work of fiction, it cannot reference another book or anything that has happened in reality. I would think that a virtual reality would still have to maintain characteristics of reality to feel real to the person experiencing it. People like reality television, and they just sit there watching it instead of living their own lives. There are even games where you basically just play to work. I think the same argument can be made for media inside a virtual reality.
Bolter and Grusin write that "by injecting media into every imaginable device, ubiquitous computing brings these devices to a kind of artificial life (218)." To relate this back to the Pine Point case, the creators could have just made a documentary or a textual website, but they chose not to. By creating an interactive website with multiple forms of media, they created a text that is "more real" because it lets the viewer choose their way of viewing it. We can look through pictures or watch video, listen to voice-overs or read the words. Even though there is a limited amount of information, the viewer can feel like it is all-encompassing because they "control" the little robot with the camera on it as it is wandering through Pine Point. It presents media within media, and I think that is part of what makes it so compelling. We are not just being force fed a story, we are actively choosing how we want to view it.