Core business

Reality is multifaceted, floating,  ever-changing, prone to sway with external and internal observers, a continual creation and re-creation process. 
What is than the core of a subject? The core that is ever unidentifiable.  The spine that holds the pages together. The vertebrae are flexible but form an unchanging entity.   
Bodies are floating signifiers on the waves of Pavlov reactions speeding through brain cells.  
Liquid motion. Movement of lines forming flesh. Pared meat, meeting in lines, meeting the lines of  brain waves.
Can you grasp a fragment of the core of a person?