White is made of all colors of the rainbow. A tomato looks red because it reflects red light and absorbs the other light. Students will further understand the colors one sees via the human eyesight test. Students will learn that we have special cells that make up part of the lining of the eyeball. They are called cones because of the cone shape.
Some cones respond to red, others to green or blue.
Cut out a small red square and tape onto a large white paper. Stare hard at the drawing for a minute. Next stare at a blank piece of white paper. Repeat the same test with a different color square. Try to identify all three cones.