[inbetween]

It's really hard to describe, and in my experience, people with mental images tend to have a hard time imagining it (and people with aphantasia seem to differ on how much they use an internal monologue, etc). In a nutshell, for me the directions either 'come out of nowhere' or there is a vague feeling of 'geometrical stuff happening somewhere in my brain, in a mostly non perceptible places'.