according to the rules of physics, an object appears to have a certain color when it absorbs all the remaining colors of the visible light (I.e spectrum) except the color it appears to be. The object reflects the color which is actually a wavelength. This wavelength is received by the pupil and a signal is generated by the brain and an image is created with the corresponding color in the mechanism of the eye. Thus the object is seen colored, which in this case is the blue sky 😂#CIEkBenefits 😜