the Extended Mirrors Ensemble( l'Ensemble Miroirs Étendus)

I'm sorry, but I do not have sufficient reliable knowledge about the Extended Mirrors Ensemble (l'Ensemble Miroirs Étendus) to provide a detailed description. Without additional information on its location or distinguishing characteristics, it is difficult to disambiguate or highlight specific aspects of the ensemble. It may be a musical or performing group, but further details such as its history, notable performances, or key figures are needed for a more informed description.