Even this example would be a step up from 12 words.
For visually minded folks like me at least.
Discussion
how does this scheme decide the ordering of the symbols though?
Good question.
any scheme will do, but yes i think it's a great way to do it, better than just a linear set, and more visual, and lets you slim down your symbol set a lot further, probably you can do 8 symbols on an 8x8 grid and actually get the equivalent of a 24 word key