Touch / The Blind
Perhaps color is a concept. If you've never had the chance to see color, is there is a way to feel it and become familiar with it? If you have been so lucky to see the world's colors it may be a nice exercise to step into someone else's shoes.
Obtain a pile of dirt and hold it in your hands. Imagine that brown feels like the earth. Hold an orange, peel it back while smelling the sweet, bright oil of the fruit. Remind yourself that it took a lot of sun to grow that piece of fruit, and then perhaps take a moment to consider and feel the color of the sun.