She stopped me as we were about to enter the chamber.

Remember, you are supposed to have never seen or even suspected the sanctuary you are about to enter. 

This was like an initiation rite. She led me by the hand across a small, dark corridor. My heart was pounding—a young initiate being put to the test before celebrating the great mysteries. I was prepared to speak when the doors opened; my words were interrupted by admiration. I was astonished, delighted, no longer aware of what had become of me, and began in good faith to believe in magic. In reality, I found myself in a vast cage of mirrors on which images were so artistically painted that they produced the illusion of all the objects they represented.