what is the "density" exactly means?

[zenmaster]

but, starting from 4th, things change. paranormal starts.

What do you mean by paranormal?
By my definition, 'paranormal' starts at 2D with the introduction of prana (or 'life force'). Science can't measure prana (or doesn't acknowledge it), so it's 'paranormal'. Maybe prana is the analog of electricity or magnetism of 1D.

Then, 3D-complexity caries with it other properties that, while possibly familiar, may be considered even more paranormal, like sentience, intentionality and thought forms.