A light signal was transmitted to a nearby Volvox if they fell within the halo’s extent. This ‘augmented’ light-based signalling mechanism allowed for a few ‘seed’ Volvox colonies that start with the signal active, to propagate the signal throughout the population as they move and interact (Figures \ref{321821} and \ref{720057}) \cite{Denniss_2019} . The efficiency of signal propagation is governed by the communication range, with larger ranges leading to more rapid spread.