Cze�� wszystkim, An interesting paper by Rocha et al., a European collaboration (including Krzyszek G�rski) on COBE analysis of equal-side-length torus models of the Universe: http://de.arXiv.org/abs/astro-ph/0205155 They use the word "asymmetric" to talk about the possibility that the side lengths might be unequal. Given the absence of any serious physical theory for the global shape of the Universe, it seems best, IMHO, to keep all options open... Pozd, Boud