Because the amoeba is aware only of itself and things with which it comes in contact, we may say that its perception of space is essentially the perception of a single point, which is a zero-dimensional perception. The transition from one state of perception to another is gradual, so that some intermediate forms may neither be clearly in one state nor the next. They can see something outside themselves and ca decide to move toward or away from it. Those insects who demonstrate size and form recognition have the beginning of perception of a surface, which is a two- dimensional perception. This two-dimensional perception is further developed and refined in fish, amphibians, reptile, birds and mammals.
Humans have the ability to perceive things of varying shapes and distances.
They can simultaneously perceive length, width, and height, and thus gave three-dimensional perception. Clairvoyants note that Spirit guides and directs the building of bodies, and thus the body inhabited by a Spirit is closely related to the state of development of the Spirit. The Spirit who is capable of only a point consciousness does not need and so would not build a body with three- dimensional perceptual abilities, nor could it function effectively in such. To a creature with a zero-dimensional consciousness, the world consists of nothing but the one point of which it is conscious. Anything that enters that point seemingly comes out of nowhere, and when it leaves it seems to cease to exist.