He asks the ONYX Reality Engine 2, lent by Silicon Graphics. And the machine (usually dedicated to flight simulators...) answers in real time, extracting from brick walls, representations of God, derived from Art History. They are floating in the air towards us. However, the explorer of this virtual world must lead his quest for pious images on his own : from a room entirely bricked up, he can dig through the surrounding walls as many corridors as he wishes, which will move all along his progression. In this way, he gradually digs a labyrinth in which he masters architecture ; but it seems to have no way out.