Written by: Robert Pettit

Most people can see that the sky is blue. It is not difficult to see that the ocean is too. Green is the color of grass and buds in the spring. Its appearance signifies the renewal of everything. We owe the color of green to the chloroplast. It ensures that life on the earth will last. So many things on the earth are green or blue. Ubiquitous are objects with either hue. However, there are some with a rare condition. With blue or green, they can make no distinction. It is due to the absence of blue receptors in the retina. This inherited condition is known as “Tritanopia”. Thanks to online encyclopedia for the information I obtained to write this poem.