WHAT ISA COLOR?

The Provensen name comes here with billboard illustrations and a marginal text that skitters coyly from one dubious image to another: ""What is blue? Buttons are blue when they are bachelor's buttons...Bottles of bluing are blue but not as blue as ten thousand policemen."" Sometimes the silliness turns into misinformation (""Eyes know what a color is""); sometimes it stretches to make an interior rhyme (""There are purple grapes with lots of seeds and lots and lots of purple weeds""). Enough?