Traditionally, interactivity in architecture has been suppressed by its materiality. Building structures that can transform and change themselves have been the dream of many architects for centuries. With the continuous advancements in technology and the paradigm shift from mechanics to electronics, this dream is becoming reality. Today, it is possible to have building facades that can visually animate themselves, change their appearance, or even interact with their surroundings. In this paper, we introduce Architectural Chameleon Skin (ARCS), an installation that has the ability to transform static, motionless architectural surfaces into interactive and engaging skins. Swarm algorithms drive the interactivity and responsiveness of this “virtual skin”. In particular, the virtual skin responds to colour, movements, and distance of surrounding objects. We provide a comprehensive description and analysis of the ARCS installation.