Three Layers of Ego
In order to understand the Internal Structures of Ego which we also refer to as Houses of Ego, it requires the awareness that there are three main layers the 1st Chakra of the Unconscious Mind, the 2nd Chakra of the Instinctual Mind and the 3rd Chakra of the Conscious Mind.
The three layers of mind work together to serve the functions of the ego in all human beings. Each energetic layer has separate functions yet all three layers are interconnected and directly impact each other. As we learn about the layers in the internal structure of the ego, this clarifies the purpose of identifying what the ego is and how it operates within us. When we understand how Ego Filters operates inside our mind we are better equipped to heal the energetic imbalances stemming from the Negative Ego or Predator Mind. 
3D or Third Dimensional Being
3D (three or third dimensional) Consciousness in used in describing the limited perception of the world as being only that which is perceived in the physical. A person who limits their perceptions to the basic 5 senses would be considered a 3D person. Such a person would not have had an awakening experience and therefore not have fully developed Higher Sensory Perception or an ability to sense energy fields and their quality.
A 3D person is usually much more developed mentally than emotionally, leading them to perceive everything through their intellect. This results in dismissing Higher Sensory Perception experiences in others as well as in themselves.