Media facades use building-scale LED or light matrices, not projectors, as a reactive audiovisual output surface

A projector is not the only way to show visuals. Computers can drive LED screens and light matrices directly — brighter light sources than projectors — turning building exteriors into media facades (e.g. the SPOTS installation’s 1800-light matrix on a Berlin office block, 2005). Beyond passive display, facades can be interactive (participants paint the surface via a web interface) or reactive, letting external input such as weather, pollution, noise, or the movement of people determine the content. For the LED/DMX and video-output lane this frames pixel/light output as an alternative medium to projection, with its own scale, brightness, and audience-relationship consequences, and points toward architectural integration of the display surface.

Examples

SPOTS Potsdamer Platz (2005): 1800 fluorescent lights as a building-scale matrix. Melbourne Federation Square Facade (2004): participants create designs projected onto the facade over the internet. A reactive facade whose imagery shifts with ambient noise or crowd movement.

Assessment

Contrast a projector and an LED media facade as output surfaces for a live set: name one advantage of each, and describe one way external input could make a facade reactive.