The idea of images as a foundational mode of creating and articulating knowledge about interactivity has been gaining traction in HCI and interaction design. The use of photography and imagery has long been foundational in traditional schools of design. Inventories of "the best" such schools-however subjective-can be found in many business press sources [1]. Here, we privilege two design schools as exemplars of these traditions, owing to their associations with two key figures, László

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... y and William Gaver. Famous for its history in connecting photography and design, the Institute of Design in Chicago was founded some 75 years ago by painter and photographer László Moholy-Nagy from the German Bauhaus [2]. In HCI the centrality of visual form has been advanced notably by Goldsmiths at the University of London under the stewardship of William Gaver [3]. Privileging these two institutions here must be accompanied by the awareness that many other fine schools and distinguished figures in the design tradition were equally important in establishing this foundational role for photography and imagery. In HCI specifically, the importance of images, per se-in a sense that includes but also extends beyond the recording of design process or presentation of conceptshas a more nascent history. The Visual Thinking Gallery that has appeared on >>>> SHARING THE HIDDEN TREASURE IN PICTORIALS