Or you could just admit that it's lots of grays and use an actual number. [0..1] for a trust scale. Trust _never_ is binary. (It also rarely is one-dimensional.

Or you could just admit that it's lots of grays and use an actual number. [0..1] for a trust scale. Trust _never_ is binary. (It also rarely is one-dimensional. But that's a different story... You might get away with one dimension, since it's restricted to a very limited set of interactions)