A chick hatching from an egg. The chicken or the egg causality dilemma is commonly stated as which came first: the chicken or the egg?. The dilemma stems from the observation that all chickens hatch from eggs and all chicken eggs are laid by chickens.
Unpolarized light can also become polarized when it is scattered in air (also known as Rayleigh scattering). This occurs due to the fact that the EM waves cause the electron in air to vibrate, producing radiation and causing polarization of the light.
When the spectrum is split into its different wavelengths then we can see colors, this is what happens when you see rainbows. Water droplets in the clouds break up sunlight into different wavelengths and then we can see a rainbow. Glass prisms (like on a chandelier) also break light into rainbows.