The phrase 'It's in the eye of the beholder' is a proverb that suggests that BEAUTY is subjective and can be interpreted differently by different people. This phrase can be broken down into three crossword solutions: BEAUTY (6 letters), IRIS (4 letters), and PUPIL (5 letters). BEAUTY refers to the physical attractiveness of a person or object, while IRIS and PUPIL refer to parts of the eye. The IRIS is the colored part of the eye, while the PUPIL is the black circle in the center of the eye. Together, these three words represent the proverb that BEAUTY is subjective and can be seen differently by different people.