How I look at things:
   Draw a line on a piece of paper.
   2D right?
   No.
   Nothing's 2D.
   Nothing's 3D.
   Our cognitive systems pretend such things really exist. Our
   mathematical systems - EXTREMELY USEFUL as they are act "as if"
   such things are real... but - they're not.
   Useful yes. Practical yes. Real? Only in skeletal form.
   There's always an 'up' direction from the paper; it's always
   bumpy. It has a start time before it existed and an end time
   where it no longer exists, and an observer that causes it to
   actually matter.