I.D. is an opera in which technology, revisiting the old tradition of illusion, is used to summon up dream and memory. To this end, a virtual singing figure was created by a process of technological development patiently coordinated by Le Fresnoy. Endowed with a body (thanks to CIRMMT, NUMEDIART and Inria) and a singing voice (thanks to Ircam), this figure comes across first of all as an image, the double of a real singer (Eléonore Lemaire). Surprised by the creation of its reflection, which seems to be alive, our figure starts on an exploration (at once mental, questioning, mnemonic) that may lead her to recognise the nature of this double, which is intimately bound up with her personal history. Alain Fleischer’s narrative, which interrogates both language and memory, undergoes a musical development which bends genres, just like the uncertainty over the identity of the technological character. Overlooking the representation, a mime (Jean Asselin) seems to be the master of ceremonies of this strange event. His gestures control an attentive apparatus, animate the figure, possibly a figment of the singer’s mind. The show is a like a dream which brings to the fore several hidden places of a human and perhaps historical consciousness. Below, the musicians of the “century” orchestra trace the continuity of this narrative which is also musical.