Spoiler alert, I guess?

So, I defeated King Desius (finally), but now I can't seem to figure out the mirror stuff in Aryth's Spire. Is it like King Desius and there's a special pattern or something, or is it just a matter of random and I'm wasting my time writing this and I should delete it?

I'm probably not making sense, like I always do. How do I put this into words? Um, I guess only the people who have gone through this territory know what I'm talking about. Remember when you had to pick between a left mirror and right mirror? That's what I'm going through right now.

~Kitti xX

here ^-^

Thank you so much!! :D