[quote=@Ebil Bunny]
Or is it more <I> the same dimension, but slightly shifted, so if your x, y, and z are at your house, then you just change your <I> slightly, you're outside your house?
[/quote]

This would be the most accurate, if x, y, and z are a position in your house, then changing <I> keeps you in the same position (theoretically) yet you are in a different place. Given your original examples, I feel that had I provided a proper example, using concepts of the system that are discussed before this section of the article, it would easily clear up your first two assumptions. I will take your observation on board, thank you.

Additionally, was there anything specifically, maybe the way I worded something, that caused you to come to your first two assumptions?