We do have 3D senses, but the primary ones aren't vision. Proprioception tells us the position of our body in space and is relevant to the discussion because w

We do have 3D senses, but the primary ones aren't vision. Proprioception tells us the position of our body in space and is relevant to the discussion because we can tag and encode information based on posture or movement, think hand-gestures, body language, right hand rule, counting on fingers, etc. Another is enabled by the existence of grid cells[1] in the brain. These allow us to be aware of (and imagine) our position in Euclidean space. This is where AR/MR could really shine by bringing the Memory Palace mnemonic to life and possibly extending it in all kinds of fantastic ways. People have exploited these senses for millennia as memory aids and ways of understanding and interpreting information, we shouldn't lose that tradition and should make every effort to enhance it with modern technology rather than replace it with a single interface metaphor. [1] https://en.wikipedia.org/wiki/Grid_cell https://en.wikipedia.org/wiki/Grid_cell