Spatiality, that's it. It really seems to make a tremendous difference for me to know where something is written down, and sometimes even remembering doing it. I always felt that doing it on a computer was indeed too abstract, losing that spatiality.

I also agree with the audiobook thing. For example, I recently thought back to a passage in an audiobook I enjoyed... and my mind instantly visualized how I was standing in front of the washing machine, doing laundry, while I listened to it.

A weird thing though is that some concepts and topics in my mind bring up images of locations that have nothing to do with the topic itself, and as far as I can tell don't match up in time. For example, one recent rather abstract concept is associated with the parking lot of my old school seen from a certain angle--many many years earlier.

I imagine that in those cases I might have been thinking about both the old school and the abstract concept at somewhat the same time, and they got associated from then on.