Picking up her handy Muon generator, ...

As soon as I saw the title, I was about to suggest that Worldbuilding might be a better fit for this - then I read the first sentence of the question :-)

World Building --> Puzzling has to be one of the strangest suggestions I've ever heard...

@jpmc26 Yeah, the content itself would fit within worldbuilding but the phrasing does not

It's a trick question. I've always known mirrors are parallel universes. If not, how do you explain Alice Through The Looking-Glass?

@miva2 The glass sort of becomes a nonphysical object at this point I guess, I tried to stay away from that

What about a flashlight? Just a shot in the dark (pun intended) as I am to tired to think this further but maybe someone isnt...

@geisterfurz007 I had the same idea, but I don't think it would work - either you can say that the light waves shine through (so the 'reflected' light we see is actually coming from the flashlight in the mirror world) or that the light particles from the real world bounce off the mirror world light particles as stated in rule 6.

Yup.. The first part was what got me struggling as well :/

Surely we are something special though. In all these infinite worlds, my counterpart is always left handed. I am right handed. I will never observe a world where I am also a righty.

@ObsidianPhoenix And yet other mirrors in those worlds will produce reflections in which you are a righty

@Zxyrra Fair point. The question then would be: how do the mirrors ensure they never form a non-reflective bridge?

@ObsidianPhoenix It's addressed in the 4th and 5th laws - it's just a property that they always reflect

Seriously this topic is somewhat spooky if you think about it... The fact that the magnet thingy does not seem to be the answer makes me feel uncomfortable :D

Side-eye. She'd disprove it with pure side-eye.

Mirrors are other universes, though. The mirror offers an observation portal on the 4th dimension; being able to observe other entities across a new dimension does not imply the ability to act upon those entities, though — we are still bound within the laws the physical laws of our own 3-dimensional universe, just like a square is bound to its 2-dimensional plane and cannot effect change upon other squares it sees attached to its cube. Corollary: televisions, computer monitors, and phone screens are also observation viewports for these alternate universes.

@IanMacDonald Those are some strong claims - most people believe they are displays or reflections of light, no dimensional changes ensuing. Can you evidence those claims?

@Zxyrra It was just a philosophical thought experiment. If you're hoping that I'll answer your puzzle, I'm afraid I have no idea. ;)

@Zxyrra Is there an actual answer or are you collecting ideas as well?

@geisterfurz007 I'm just collecting ideas too

Oh ok! I thought there would have been an intended answer still not found by anyone.

Vaguely on-topic: in some FPS games like duke nukem, mirrors are implemented by the mirror not actually existing, but instead being a sort of pseudo parallel universe, with an identical, reversed, room with a copy of anything in the room the player (and bad guys).

according to law 6, the only reason something cannot pass through the mirror is because it meets itself at the entrance. Law 7 says "substances 'stuck' to each other." This contradicts Law 10, as there would logically be nothing to break. Thoughts?