Fig. #1. The above diagram might be a good representation of the nine major levels that make up the physical Planes of existence that are found upon lower, middle Earth. It is to be noted that Lower, Middle Earth is divided along different veins, wherein each vein... each thread of creation governs and limits the possibilities within each individual.

While all three--Higher Earth, Middle Earth, and Lower Earth--have residents, of sorts, the TwinSpecies: Human (called Man) resides upon lower, Middle Earth. Lower, Middle Earth can be identified by the letter L of Middle Earth. The evolution of Man will one day allow it to transmigrate from lower, Middle Earth to middle, Middle Earth... that is if Man lives long enough to outgrow his errant emotions.

Lower Earth is mostly populated with lower species, such as dogs, cats, etc. It is important to note that while the above is clearly divided, all three levels occupy the same space--the difference between the three is a difference in the bands of frequency that govern all residents.

Higher Earth is mostly populated with life-forms that are more evolved than the TwinSpecies: Human, usually simply called Man. Most of Earth's OtherWorld Teachers reside upon Higher Earth.