Relationships exist between the ins because they are definable. Out is nothingness, i.e., nonexperience. Only the nonexperience nothingness constitutes continuum. There are no experimentally demonstrable continuums. All that has been found is discontinuity, as in star constellations or atomic nuclear arrays.
Areas are discontinuous by constructional definition.
There are no surfaces. Therefore, there are no areas. Our definition of an opening is that it is surrounded, i.e., framed, by trajectories. 524.33 Every trajectory in a system will have to have at least two crossings. These are always as viewed, because the lines could be at different levels from other points of observation.