What is Beauty?

Third grade is beginning a PYP unit of inquiry under How We Express Ourselves, regarding beauty in the arts. The central idea is: Through the arts people learn to appreciate the many faces of beauty. 
As a provocation for this exploration students are bringing in art objects from home and sharing their criteria for why they think it is beautiful. They will then share with classmates, and then with other classes and teachers.
In order to enhance and expand our students' understanding of beauty and the our unique interpretations and perspective on it, we want to hear from others at Spicewood, in our community, and around the world.
We would like for you to share what you think beauty is. In the comments can you tell us what your criteria for beauty is-what makes something beautiful to you?
We appreciate your contributions and look forward to learning from you!