But I am getting stuck because I noticed that some decks that a few years ago I found unreadable (more or less) I find completely readable now. That means there is a huge personal factor as well as one's evolution as a reader. That surely complicates finding a 'rule'. To find a 'rule' that would apply to most I think we have to leave out ('rule out', ha, ha) ALL the personal factors that makes a deck readable.
Good point. Either you're right and we must leave out all the personal factors, as you say - or we can generalise about those factors? Getting too many layers deep, probably.
For example something like traits that connect with the reader's life experience... I'd love to know if aesthetic response is somehow related to readability but I imagine it would involve huge experimental psychology studies, comparable to the research that's done for marketing, how colours and music etc affect our buying impulses... well beyond the scope of anyone I know.
I'm thinking, also, it must relate to the reader's experience(s) with reading. How much experience, and what correlations etc they've come across and dreamt up.
What remains then is what has been already stated in the previous posts:
- to visibly follow a system (thoth/rws/marseille) (JadePixie) otherwise I couldn't consider it a tarot deck but an oracle
- to has symbolic/semiotic visual clues (JadePixie)
- the images on the cards to evoke a reaction in people's imagination (even if they don't like their artistic style) (MandMaud) The card has to be visually expressive (and impressive! ha, ha)(I get bored easily with those deck that fail to impress me)
- the cards has to work well with each other, i.e., it's easy to see the dynamic, direction, focus, patterns of a reading. (MandMaud) (I'd add the uniformity of the artwork and fluidity but that could be a personal preference only)
I think the uniformity of the artwork probably is a personal thing, as you suspect. I don't agree with you on requiring a system, either; I suspect people who really don't learn any system and so their reading is 100% intuitive, probably still have some subliminal consistency going on without knowing it, which would qualify as a system although they'd reject the assertion.
I don't know if anyone really does read the cards without any system but I've seen some inexperienced readers on AT declared that they do (and my ex refused to learn any basics, claiming he'd do it purely by intuition, but then didn't pursue the interest so I can't call him a fair example). ... Beginning to sound like I do agree on a system after all! Oh well.
That's a LOT to ask from a deck made of 78(!) cards! I believe any deck that complains with these requirements would be well readable for most people. Or would it?!
I think probably! Of course 'visually expressive' will vary for different people - but I should think that if you gave people a survey rating characteristics of a deck they knew, and they scored it low on visual expressiveness, that would correlate with low readability.