Astral pockets, Structuring and merging

Can someone expand on purposes and mechanics (how they work)?
What happens if you raid someone else’s astral pocket?
How large can they be created?
How do they work?
When you use a mirror or calendar exercise to merge a past self with your current self, to shift power backward and forward, age better, etc, is this an example of structuring and merging, or is it more like cretlating a golem for a spirit to inhabit? Why not just a speaking statue or speaking doll?
How does it work in detail?

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These are all great questions. It would be fun to have the answers to them.