(A) Illustration of the evolution of the number of clusters for three replications with N = 30, 50 and 60 pedestrians.

The clustering method is described in the Materials and Methods section and illustrated Fig. 2. During the first ten seconds, the initial transition from disorder to order is visible. Then, the number of clusters oscillates between well-organized (five clusters or less), and disorganized states (ten clusters or more). (B) The corresponding segregation dynamics for the same three replications.