  This work presents a simple alternative technique to observe the polarization
of the skylight on Earth. Using a birefringent material and a polarizer to look
at the polarized light from the blue sky, it is possible to see a colored
pattern that is associated to the birefringence of the material and the
polarized light. Three different ways to polarize the light are also discussed
in the context of the proposed experiment.
  Keywords: Blue sky, Rayleigh scattering, birefringence, polarization,
education.
