One day, Enrico Chapela (Mexico City, 1974) watched a documentary about how humans have three types of cone cells in their eyes that perceive red, green, and blue, and how the colors we see are produced by trichromatic vision. However, people with color vision deficiency have genetic mutations that alter one of these types, restricting their color perception range. These cones can also mutate into a fourth type capable of perceiving ultraviolet light, a phenomenon that only occurs in some women, known as tetrachromats.