Mirrors are used in magic shows
[S1 Science: Magnetism]
How do you think the ballerina spins?
It's pretty deceptive, hiding a magnet behind the mirror like that. And here I was, trying to recreate the spinning-in-front-of-a-mirror at home! (It's not a fun experience, I fell onto the floor a couple of times and my palms hurt like I've rocks tied to them, don't try this.)