Directional prepositions

Like demonstratives in Reisu directional prepositions have one more degree than English. For example we can talk about 'below' as directly below (vu) and below with at least some separation by distance (yu).

Ha	Beside, next to
Bi	Beside, but not directly next to. Implying an object or some distance is between the two things
Vu	Below, directly below, hanging from
Yu	Below, with an object or distance seperating
Fa	On top of
Ka	Above
Ma	Directly in front of
Be	In front of, with distance or an object sepearting
Di	Directly behind
Fi	Behind with distance or an object between

Examples of Ha/Bi:

Po okoko ha okoko eino kuala obani.
Inside House beside house 1S-POSS equals neighbor.
In the house next to mine is my neighbor.

Po okoko bi okoko eino kuala obani.
Inside house beside-with-something-separating 1S-POSS equals neighbor.
In the house down the street from mine is my neighbor.
Bi could mean the house is two doors down, across the street or down the street.

Po okoko bi okoko eino ukuala obani.
Inside okoko far-from house 1S-POSS NEG-equals neighbor.
The people in the house far from me are not my neighbors.
This use of bi implies the other house is very far from the speaker's house, too far to be neighbors.