Men and women
-- negative polarity -- positive polarity
in the real world
Roads are an example of intersecting lines in the real world.
Scales or balances.
A Jarlid
Balls
McDonalds Arches
On Batman(donnanonanon!)
normal_distribution
Railroad tracks, the edges of a book, and the lines on a ruled notebook paper are real-world examples of parallel lines.
The exact center of the Earth.