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Designing interactive applications for Media Façades is a challenging task. Architectural sized large-scale screens can result in unbalanced installations, and meaningful interaction is easily overshadowed by the drastic size of the display. In this paper we reflect on urban technology interventions by analyzing their spatial configuration in relation to the structuring of interaction. We outline basic categories and offer a new terminology to describe these interactive situations designed for the built environment.

Media facades (often characterized as a building's digital skin) are public displays that substitute dynamic details and information for usually static structures. SMSlingshot is a media facade system at the confluence of art, architecture, and technology design in the context of urban human-computer interaction. It represents a participative approach to public displays that enlivens public spaces and fosters civic and social dialogue as an alternative to advertising and service-oriented information displays. Observations from SMSlingshot's implementation at festival exhibitions provide insight into the roles of scale, distance, and the spatial situation of media facade contexts. The lessons learned apply to most public-display situations and will be useful for designers and developers of this new medium in urban spaces.

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