E-volver (2006) is a site specific work for the new Research Labs of the LUMC in Leiden. It consists of four breeding units, five large prints that are spread throughout the building. The software at the breeding units generates a group of eight unicellular agents that can move from one pixel to another. After sensing its environment the agent can modify the colour of the pixel. The accumulation of these actions and interactions of all the agents results in a colourful image that keeps on changing over time. The people in the building influence the behaviour of the agents via selection on a touch screen. On the basis of personal preferences the selection process gradually evolves a group of agents that contains properties that generate intriguing images. Click on the images below to see a fragment of three different cultures that are evolved with the E-volver system.