Not effective at short wavelengths, so light often looks bluish. Not useful for polarizing because of this difference. Back of eye has polarizing material, the yellow pigment in the macula lutea, which covers the fovea. Get Haidinger's brush. For vertical polarization, see blue horizontal stripes above and below a yellow horizontal stripe.
Some people can see polarization without filter as the light from the sky is polarized.
Project blue on screen. Hand out polarized glasses. This is very good for a movie to get 3D effects. We were able to do this with color, but there the eye had to fight the strong effect of color to make the two images superpose. Each time the light is polarized, some of it is lost.