Natural blue skies. The sun produces lot waves from a range of frequencies from the ultraviolet to the visible spectrum. And some skeptics believe a range of colors exists beyond this band of light. In most cases, the frequency of light rays fall within the visible light spectrum, and that's detectable by the human eye. Since sunlight consists of light with the full range of the visible light frequencies, it appears watts as discussed in the previous lectures, this white light illuminates our outdoor world and the atmosphere that surrounds our planet. So if light is an effect of color on an object, then why does our sky appear blue This is a result of the interaction of sunlight with the atmospheric part.
To produce a blue sky, the atmosphere contains a variety of types of particles, the two most common types of them that are present in the atmosphere, nitrogen, and oxygen. These particles are most effective in scattering the higher frequencies of light and illuminating the shorter wavelength of the visible spectrum. This illuminates the sky with the light of a blue violet end of the spectrum. However, our eyes are more sensitive to the light with blue frequencies because of the focus blue cones in our retina. Thus, we review the skies as being the color blue and not violet except upon sunset. In relation to our position in the universe, we can apply a simple principle to planets outside our solar system, planets or stars which appear blue and move Moving towards our galaxy.
While those galaxies moving farther away from us will appear red. This is just a side note and should not be really focused on in terms of our everyday environment in design. However, this type of natural environment application could be applied to any design objects which are in observable motion. Like cars under motion like police vehicles will appear to be flashing more blue when they're moving towards you. But when they're moving away from it, they will appear to be flashing more red. This is the same when you see the tail lights of a car.
We use red to distinguish the backside of that vehicle and headlights appear more blue when they come in towards you.