Jesus called it as He saw it. He was straight forward and straight up about many things.
Yeah, He oftentimes used parables to teach the people. What He was doing was using something that people were familiar with or understood well to share a life lesson in a subtle manner.
But He was usually straight out about things.
Ye are the light of the world. . .
The light of the world is a twofold metaphor.
The Light is Seen by Others
If we are the light of the world, then we should be shining as the light. That’s the nature of light. Light shines. Jesus shared for us to live as the light and not hide our light under a bushel.
The Light Helps Others to See
. . . it giveth light unto all that are in the house. Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.