Arch-OS constructs a ‘virtual’ architecture from the dynamic activities that take place within the Portland Square Development. Arch-OS uses a range of embedded technologies to capture audio-visual and raw digital data from the building through: the Building Management System; its computer and communications networks; the flow of people within it; changing noise levels; weather, light and temperature changes. This vibrant data is then manipulated (using computer simulation, visualisation and audio technologies) and replayed through projection systems incorporated into the architecture and broadcast using streaming internet technologies.