stand up...
that is a perpendicular line right there. you are 90 degrees with respect to the floor.
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Real life example of parallel lines are railroad tracks and rows in a garden. Also the lines on a basketball court are parallel
the Horizontal line of you bed to the vertical lines of your bedposts
the lines of the brooklin bridge
Railway lines with sleepers? Lines of latitude crossed by a line of longitude?
The walls of most buildings are perpendicular to the ground they are built on.