and that which is absent, such that we can gain access to what is absent in the picture. Once again we are thrown back to this idea that the perceiving is an achievement of access by making use of skills, knowledge. I need to know what Hillary looks like in order to recognize Hillary in her picture. A striking feature of pictures is their immediacy. A picture of Hillary doesn't seem to be a symbolic representation of Hillary. There seems to be the sense in which merely knowing how to recognize Hillary or how to recognize a human form, a figure, is enough to recognize a picture of Hillary. There is this idea that we don't need any further knowledge or further skills in order to perceive something in the picture. That is a very interesting idea. But, in fact, there is a nice comparison we can make to help us see that pictures don't really have this sort of immediacy. Think about something like the Macintosh operating system. No promotional endorsement intended, but the Mac OS is user friendly. If you understand a few basic metaphors, about the desktop, clicking, open files, closing files, a few basic metaphors allow you to unpack just about any program that you might be working with. So there is a sense in which the functionality of the graphical user interface is straightforward and immediate. But, of course, that is precisely because the engineers have built the program with our particular predilections and capacities