Examine any line closely and it begins to look ragged around the edges, being made up of particles of some kind–whether wood, metal or ink. Examine even closer and the physicists tell us we will meet atoms, all vibrating unpredictably, their electrons disappearing and reappearing in different places without traveling in between.
Examine any life closely enough and it begins to look ragged around the edges as well. Though some may try, no one can live their life traveling in straight lines.
A line is purely a thought people share, a concept imposed on reality: a perfectly straight arrangement of non-existent particles that have no width. This is the geometric definition of a line. and it points out the underlying erroneous principle in the concept: that anything can be one-dimensional.