You see what appears to be a mirror with very ornate wooden rim and a nice leather handle to hold it by. You turn around to the genie and ask how this mirror could possibly hold any form of a genie.
"Curious, young one. That mirror works a little differently compared to the rest of our 'bottles'."
"Define different." you reply
"Ok (sarcastically) different is when something is not the same as another thing or each other; unlike in nature, form, or quality."
"You know what I mean. I mean the difference between this mirror and any other genie bottle in here." You angrily reply
"Ok fine. I only was having a joke. That mirror makes you live in a parallel universe where everything is reversed. It technically is called the mirror world. You will see identical copies of people in the real world except they have the appearance of that person if that person was looking in the mirror. That mirror also gives you a unique wishing power where if for example someone says 'I wish I was a girl' then you would make their wish the opposite so it would change to 'I wish I was a boy'."
"Well that's quite new. I never heard of something like this." You respond quite shocked
"It isn't very popular as a choice of genie bottles. Any way is that gonna be your genie bottle or are you gonna pick another bottle."