If all you could see was the color blue, wouldn't every paint in the tube and on the palette and on the canvas look blue, too? So why would a person who saw only blue paint pictures that were mostly blue? In high school I bet my friend Pete Biere that our English teacher Evelyn Hedyn would believe anything that she'd heard from two different sources. In my humanities class I told Mrs. Hedyn that Van Gogh painted the way he did because his retina had detached in his eyes. A few days later a friend (maybe Peter) told Mrs. Hedyn in an English class the same story about Van Gogh. In a few months, she was repeating this to her other classes.