"4D-Pixel" (2004) by Daan Roosegaarde and Peter de Man is a responsive sound installation.
The sense that architectural space is more than a collage of construction elements combined with a desire to use 'interaction' as a basic building material drives the 4D-Pixel wall. Developed as a responsive smart surface based on intelligent software and electromagnetic technology, the wall reacts physically to voice and sound. Its beauty is determined by the behavior of the visitor, its shapes constantly evolving, reflecting new input collected from its immediate environment. Daan Roosegaarde is a recent graduate of the Berlage Institute, a Postgraduate Laboratory of Architecture. Peter de Man studied at the Saxion Hogescholen in Enschede specializing in interactive objects.