We are bombarded today by such a quantity of images that we can no longer distinguish direct experience from what we have seen for a few seconds on television. The memory is littered wth bits and pieces of images, like a rubbish dump, and it is more and more unlikely that any one form among so many will succeed standing out.If I have included visibility in my list of values to be saved, it is to give warning of the danger we run in losing a basic human faculty: the power of bringing visions into focus with our eyes shut, of bringing forth forms and colors from the lines of black letters on a white page, and in fact of thinking in terms of images.