Answer:

Beauty is in the eye of the beholder. It’s subjective, personal, skin-deep. Brains go much deeper than skin – they affect who you are and what you do with your life, both on an intellectual and emotional level. A person can be beautiful but empty inside (and empty-headed). Or someone else might have a pretty face but they’re kindhearted; or smart; or opinionated; or strong; or accomplished. There are all kinds of beauty out there to be had.

So beauty is wonderful if it resides on the outside where everyone can enjoy it together through observations — similarly concerning views about intelligence which reside so often inside someone’s head for others to evaluate by sharing their opinions externally with that person or others.