Arbitrary Actions, or Person-Action-Object?
My memory system is based on Ben Pridmore’s but with a few modifications. The core idea is the same though: decimal digits are chunked in 3s, binaries in 10s, and cards in pairs. I also have a 2-digit system and a single-card system because I don’t think I will have my 2,652 double-card images ready by the USA Memory Championships in March.
One thing that I’m trying to figure out is whether it’s worth converting my two digit system into a person-action-object (PAO) system. I sometimes have trouble creating a wide enough variety of actions to go with my characters and objects.

If the first number is a can of tuna fish (12), the second number is an onion (22) and the third number is Aphrodite (84), what is the tuna fish doing to the onion and the onion doing to Aphrodite that preserves the order, and how do I make it unusual enough to be memorable?
If I changed it to a PAO system, it might be something like:
12 = [person] -> using a can opener -> can of tuna 21 = antelope -> hopping -> tall prairie grass 22 = a chef -> chopping -> an onion 84 = Aphrodite -> emerging from water -> shell
12-22-84 would then be a person chopping a shell. 84-21-12 would be Aphrodite hopping on a can of tuna fish 22-21-84 would be a chef hopping inside a shell 21-84-22 might be an antelope emerging from water with onions stuck to its horns

I went back to read Ben’s description of his system and there is a useful clue:
Some of these objects are people, some are things. I ‘see’ them arranged from left to right, or top to bottom, and interacting in various ways according to rules I made up as I went along, depending on which objects come together in what order.
I’m not sure exactly what I’m going to do, but I might experiment with PAO for my two digit system, and use a loose association of actions with my three digit system. I like the idea of the loose association better than being locked into a strict set of PAO rules, but I don’t know if there is time to do it before March.
UPDATE: Part 2 is here.