  We discuss statistical and physical properties of cosmic microwave background
polarization, both in Fourier and in real space. The latter allows for a more
intuitive understanding of some of the geometric signatures. We present
expressions that relate electric and magnetic type of polarization to the
measured Stokes parameters in real space and discuss how can be constructed
locally. We discuss necessary conditions to create polarization and present
simulated maps and correlation functions for some typical models.
