“In 1974 Sol Worth and I published a paper, ‘Symbolic Strategies,’ which presented the outline of a theory of interpretation — the assignment of meaning to objects and events. The questions we focused on in developing that theory centered on the peculiar properties of visual images. Although our paper addressed the general issue of how humans assign meaning, in retrospect it is clear that we were primarily concerned with visual images in general, and film or photographic images in particular. The basic question that we were asking might be put this way: What can we know from these images, and how can we know it?”