Step 1: Understanding the Concept: 
Sigmund Freud proposed two models of the mind: the topographical model and the structural model. 
The Topographical Model describes the levels of consciousness, like a map of the mind. It consists of: 
    
 Conscious: What we are currently aware of.
    
 Preconscious (or Subconscious): Thoughts and memories that are not currently in consciousness but can be easily brought to mind.
    
 Unconscious: A reservoir of feelings, thoughts, urges, and memories that are outside of our conscious awareness, often because they are unacceptable or unpleasant.
The Structural Model describes the "parts" or functions of the personality. It consists of: 
    
 Id: The primitive, instinctual part.
    
 Ego: The realistic part that mediates between the Id and the Superego.
    
 Superego: The moral conscience.
Step 2: Detailed Explanation: 
The question asks which option is NOT a topographical aspect. Conscious, Unconscious, and Subconscious are all parts of the topographical model. The Ego, however, is a part of the structural model. 
Step 3: Final Answer: 
The Ego is a component of Freud's structural model of the mind, not the topographical model.