There is no gravitational dipole, obviously because there is no form of mass analagous to negative charge. But think about this property of electromagnetic currents: negatives moving to the left and positives moving to the right both generate identical magnetic fields. This means that we could make negative gravitomagnets, in addition to positive ones by using normal mass spining in the negative or positive directions, respectively. Perhaps this is old hat for some of you, or perhaps it is false (too naive, though I know EFE take on a similarity to maxwell's equations in some particular weak field approximation). The point is, I want to address the following claim from one of our recent sci-fi artificial gravity threads: Perhaps not so if we can generate gravitomagnetic multipoles and therefore calculate mass distrubutions that produce asymmetric fields. What do you guys think?