Classic?

Cassie is coloring a page in a coloring book, which depicts a basket of fruit. She has colored the grapes, the cherries, and the apple red. She looks up at me. "Plums are purple."

Unbidden come marching through my head battalions of pale green Reine Claude plums, squads of round red supermarket plums, neat rows of those speckeledy pink plums. "Um," I say in hesitant agreement, "Lots of plums are purple."

"Well," she says, in a surely-we-can-at-least-agree-on-this acknowledgment of my qualms, "purple is the classic color for plums."