On your lunch break at work, every day you go outside and sit in the park on one of the benches and eat your food.
Every working day for 2 weeks a blind man makes his way to the same bench and you end up talking.
You find out that he has been blind since birth, likes to eat fruit (specifically oranges, apples and bananas) and is generally curious about everything.
One day, he holds up the orange he is about to peel and asks you to describe the color to him.
What do you say?