  Assuming that at small distances space-time is equivalent to an elastic
medium which is isotropic in space and time directions, we demonstrate that the
quantum nematic liquid arising from this crystal by spontaneous proliferation
of dislocations corresponds with a medium which is merely carrying curvature
rigidity. This medium is at large distances indistinguishable from Einstein's
spacetime of general relativity. It does not support torsion and possesses
string-like curvature sources which in spacetime form world surfaces.
