That is still O(N^3) in my opinion. If you scale up the media in all directions, your data scales like the cubic. The charge level makes it maybe 3.1 dimensions

That is still O(N^3) in my opinion. If you scale up the media in all directions, your data scales like the cubic. The charge level makes it maybe 3.1 dimensions, but it isn't really scalable. Now if you could add arbitrary voltage levels without losing precision, that would be 4D.