Beauty
I have asked myself what is beauty a thousand times. Kant gives me answer that is clear to me.
"Beauty is the form of the purposiveness of an object, so far as this is perceived in it without any representation of a purpose."- Immanuel Kant (Critique of Judgment, Book I, Section 17)
Hence that flower which attracts the bees for the purpose it is serving, but without being a loudmouth about it, is beautiful.