I know this system best via Giordano Bruno (burned at the stake 1600) and Dame Frances Yates.
This is an ancient “art” with several methods of use.
My favourite is the method of loci or Architectural Memory.
It’s not so hard. We do it all the time – especially in a supermarket. Until they move stuff around the aisles and shelves. Harumph!
Today it’s not so well-known. Especially when we bring in melted buildings and mud flood and DEWS and Giant Elites with tiny servants and bedsits and tower blocks and ….!
I’d bet that most of the population only know anything about this via the TV series Sherlock.
Old World vs New World :o)