In ‘Pure Movement 3, environment 1’ Ulla Nolden investigates her perception of the subtleties of everyday reality. Varied yet balanced movements catch her attention. Over time the rules governing a movement are clarified, formalised and translated into computational instructions. Nolden’s computational representation of swarm behaviour draws on the work of Craig W. Reynolds and Daniel Shiffman. Although based on very simple behavioural rules, the resulting group movement becomes very complex. Nolden visualises the abstract algorithm using the aesthetic language she developed in her photographic work which explores marginal scenes in her everyday environments.