Singularity in French both refers to uniqueness of places on earth and to the conception of this unique case as one realised possible among many other similar spatio-temporal trajectories in the dynamics of complex systems including bifurcations. Here is demonstrated how simulation models that reconstruct the evolution of geographical systems enable to circulate between these two acceptions of the singularity and even to overcome their apparent contradiction. I apologetically illustrate this idea by a singular narrative recalling the genesis of the Simpop model series, that was a collective venture in a constant practice of pluri inter and transdisciplinarity.