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What does it mean that beauty is in the eye of the beholder?

Beauty is in the eye of the beholder:

guardian

Example:

Where is the beauty? The eyes of onlookers.

Love is blind.

Indeed, beauty lies. The eyes of onlookers.

Indeed, beauty is in the eye of the beholder.

She looks ordinary, but he likes her very much, but the beauty lies in it? The eyes of onlookers.

She is plain, but he loves her very much. Love is blind.

I don't understand why he thinks she is beautiful, but beauty is born. The eyes of onlookers.

I don't understand why he thinks she is beautiful, but beauty is in the eye of the beholder.

Love is blind.

Love is blind.

What is beauty? The eyes of onlookers.

I don't know if everyone agrees with the beauty in my eyes.