What is an observer? - When we observe a scene, there is a lot we take for granted. We 'see' a 3d scene of object forms and behaviors through time. We can predict behaviors from the past and into the future. And we can animate our bodies to interact with objects and effect the course of history.

So there is a lot going on when we invoke a simple concept like an observer.

I propose that there are certain preconditions for an observer perspective.

1) A frame of reference- in our case a 3d reality.

2) A representation of that reference - in our case a mind of linked information patterns mimicking the consistent sensory behavior of that 3d reality.

3) An observer, or privileged platform - to 'observe' those patterns. Meaning that the surfaces represented within the model have a physical relationship to each other and a physical relationship to the observer platform (through a 3d translation matrix). That is, a matrix of muscle script patterns arranged in a 3d map, or matrix of points (points of physical resolution) representing a 3d space.

4) A body of truth to align patterns with, and a 'feeling' or 'value' system to 'collapse' the simulations into a preferred perspective through time.

This process of observing external reality under such a technological framework, I call the polarization of 3d reality. Polarization into the observer and the observed. The observer 'platform' is proposed to be a 4th dimension phenomenon because, among other evidence, representations of 3d space can take on any 'known' form or behavior prior to collapsing into the 'conscious'.

Now when a point travels through time, it describes the 1st dimension (it traces a line). When a line travels through time, it can trace a surface or plane - the 2nd dimension. When a plane travels through time, it can trace a volume and so can describe the 3rd dimension. When a 3d form travels through time, it could describe the 4th dimension, although our 2d senses cannot witness such an event. And our 3d mind patterns cannot simulate such an event. But from the observer platform, 3d space can be witnessed and collapsed. Just as a 2d picture can be witnessed and 'collpased' when stepping out of it into the 3rd dimension.

Further discussion is here