what is the "density" exactly means?

[zenmaster]

the subjective element is not useful for us in this however :

the properties of 4d, is brought by 4d vibrations in core photon vibration. it is a physical and measurable situation. this, then gives the properties of 4d, to the 4d physical. and this will be what determines whether a material vibrating in 4d spectrum, will collide with a material vibrating in 3d spectrum, or not.

Probably not. I was still deducing the properties of 2D (vs 1D), in order to answer the question of what a 'density' was.

Since we do not really understand the electrical properties of 1D, let alone 2D, I'm not sure how we can really determine the nature of incompatibility between 3D and 4D.

What's confusing further is that the 'dual-activated' entities have 4D and 3D bodies which are compatible with each other.