Short piece commissioned for the ‘Modern Times’ project by Stichting Cinema Zuid in collaboration with the One Minutes. Part of a long-running exploration of algorithms that are based on a combination of propagation and local interactions. Originally triggered by an encounter with simulations of how nerve impulses organise themselves into oscillations in tissues like heart muscle, the project has since expanded to include an interest in the more general emergence of patterns in time and space out of homogeneous starting conditions.