After a chat with Rob I have decided that all of the things in the room need to be reflected rather than just some pieces. I couldn't justify only some things being reversed so if everything is reversed, it will literally be another world and you can peer into the other world that's the right way round through the mirror on the wall. That way, whatever you do to one, will immediately and inevitably affect the other, much like in Quantum Entanglement. It basically just makes a bigger statement than if just bits of it were back to front. The only the problem now is, how do I create the text back to front? I've done it with photocopying but it doesn't give a very polished finish; photocopies...? And I can't do it back to front with letterpress as the letters are already reversed! And with the typewriter, well I'm pretty sure it would be impossible to type it back to front.
"Alice is playing with her kittens — a black kitten and a white kitten, the offspring of Dinah, Alice's cat in the first book — when she ponders what the world is like on the other side of a mirror's reflection. Climbing up on the fireplace mantel, she pokes at the wall-hung mirror behind the fireplace and discovers, to her surprise, that she is able to step through it to an alternative world. In this reflected version of her own house, she finds a book with looking-glass poetry, "Jabberwocky", whose reversed printing she can read only by holding it up to a mirror."