Oriphiel

The reflection and refraction of waves of light. When a beam of light hits something, it is simultaneously repelled and absorbed by it in different proportions, depending on the substance's features and "true" pigmentation. Each wavelength of light in a beam has different properties, including a different color (Red, Orange, Yellow, Green, Blue, Indigo, Violet). The wavelength of light that is absorbed the least is repelled in the greatest amounts, and the subsequent reflection bounces around until it hits the human eye. Our eyes work by taking in these reflections of light, which allow our perception to form a stream of images that reveal the depth and and details of the world around us. It's kind of like sonar, but with light waves instead of sound waves. As an example, when leaves are alive they use chloroplasts to take in energy from the light of the sun, and love to absorb the wavelengths that are reddish in color. Green is not reddish at all, and is repelled in the greatest amount as it can't be absorbed and used efficiently. But when the leaf dies, and the chloroplasts die and no longer absorb great quantities of light, the rate at which light is absorbed shifts, and red and yellow are reflected in the greatest amount.

And so our eyes perceive the sky as blue, because that is the wavelength of light that is reflected in the greatest amount.

Favorite kind of chocolate (milk, white, dark, etc.)?