Here's how I would describe it:
In act 1, we see the main set, which is a very ornate, but ordinary room. Then, during the transition, the back wall of the room is removed, and replaced with clear glass. On the other side of the glass is an exact replica of the room, set up in a mirror image. So it almost appears as if the clear glass were a mirror. THEN on the other side of the replica room, is an ACTUAL mirror, reflecting both versions of the room. So it's like you're seeing 4 versions of the same room. The beauty of it (besides being a cool effect) is that it's actually very difficult at first for your brain to make sense of what you're seeing. It's hard to tell what is a reflection, and what isn't, which is trippy.
Then at the end, the mirror angles downward IIRC, so you see the replica room kind of from a higher angle through the reflection above the real rooms.
Updated On: 5/24/18 at 11:13 AM