So clocks work hypothetically for me for several reasons.
Always with you. Works without batteries.
Ones with adjustable frames that indicate hours are good too. To add storage you could color code or so
Also if you picture your second hand in your palace that could act as aid as well.
You can associate things like hand positions and their measurement for your presentlocation to quiz yourself an also Vesalius jump from room to room with the clock. As you change seconds you could change ideas represented on the room number or you could have room one have a tree for a visual association (“1” looks like a tree from a distance) represented by the minutes.
And then so on at disgredsion. This is potentially infinite but probably gets difficult due to repeated use of the clock so you could use a chess board with positions or something else that’s highly modular yet designed for interaction. If you have a pawn on a certain square it may also store a value like… say you make a list of properties or categories and list them in the a1 position assigned ex where the rook is you could have the category Logic. The rook could be the subject. And… you could help memorize chess games this way easily and have taking pieces be the journey through the palace.