  We analyse the CMB radiation in spherical 3-spaces with non-trivial topology.
The focus is put on an inhomogeneous space which possesses observer dependent
CMB properties. The suppression of the CMB anisotropies on large angular scales
is analysed with respect to the position of the CMB observer. The equivalence
of a lens space with a Platonic cubic space is shown and used for the harmonic
analysis. We give the transformation of the CMB multipole radiation amplitude
as a function of the position of the observer. General sum rules are obtained
in terms of the squares of the expansion coefficients for invariant polynomials
on the 3-sphere.
