Um... Honestly, I don't fully understand it myself. My senpais have far more experience with this, but...

[So she has to think long and hard about how to make this coherent.]

—Oh, I know! Let's say... You own a house, and to you, that house is your castle. In the real world, it's just a house. But in another reality, your house truly is a castle because you think of it in such a way. [A beat.] ... Does that make sense?