The method of loci is still largely a peg list to hang items on, but with a spatial component. It is effective, but it remains to be a method for remembering ordered items at its core. I understand that a base memory palace can be amended by other peg lists to zoom into certain locations. Versioning of certain loci with colour or environment (oily, frozen, lava etc) might be ideas of how to accomplish that.
My question to the memory community is this: Do you and how do you use a memory palace for reflecting on hierarchical information? It might not even be a good idea…
The application might be a book with its chapters, section and paragraphs, or a paper with introduction, research part and conclusion.
Please comment freely 
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Thanks. I have thought about doors or portals along the lines of walking inside a Rubik’s cube using each face as a portal into another Rubik’s cube. In principle, the Rubik’s cube might by anything between 1x1x1 and 3x3x3 or even higher dimensional.
As much as I like the concept, I have to say that it does not work for me, because the locals I create remain either blank to the point of being easily confused or, if I create a distinctive locale, it is a rather fleeting memory in that it disappears from memory pretty quickly. (This problem of fleeting memory with a nested memory palace might be wholly a personal fault because of lack of attention or dedication.)
I will have a try at the cup idea, though! If there are other opinions or experiences, please share!