If vision can be considered the basis of geographic inquiry, then it must involve looking with discrimination--the ability to discern clues in our surroundings that speak to spatial processes or patterns in all aspects of geography--physical, cultural, economic, and so on. Geographic thinking also involves making spatial generalizations. We do this with "interval" and "ratio data" by means of various statistical measures. But we also do this with "nominal" and "ordinal" "data" by the way we process graphic images. This paper describes a way of combining these ideas in a classroom activity that allows students to discover the nature of one geographic generalization (regions) and the kinds of evidence that we use to construct them. It involves "National Geographic" magazine illustrations assembled and mounted into rows and columns for specific geographic regions based on written descriptions found in the literature. I call these assemblages "photographic mosaics." Matching the visual and verbal evidence helps students to learn and improve their command of geographic language.