This animation shows signal transfer through the external space of the space matter network of the growth only version of the SERD model. The simulation uses the following state evolution to generate the propagating signal, 0 goes to 1 if at least one neighbour is in state 1, 1 goes to 2 and 2 goes to 0. Signal is observed travelling between point particles, and firing on point particles. The signal passes through all nodes of the network due to the connectivity and and signalling state evolution.