Lesson plan for One by Kathryn Otoshi. Blue is a quiet colour who likes looking at the sky and floating on waves. Sometimes he wishes he was more like his friends Orange, Purple, Green and Yellow but he’s happy being Blue – except when Red comes around. Red is a hothead who picks on Blue. Although Blue's friends feel bad, they never try to stop Red until One comes along. When One stands up to Red, the other colours learn that everyone, even Red, matters.