That's Art?

Overheard at the Morton Arboretum...
Brunette twin:  "Mom, what's that?"
Mom:  "It's part of the art exhibit."
Brunette twin:  "Really, it doesn't look like art.  It's ugly."
Mom:  "Art isn't just a pretty painting.  Sometimes it's just meant to make you think."
Brunette twin:  "Okay. I'm thinking it's ugly."