  On the basis of an algebraic relation between torsion and a classical spinor
field a new interpretation of Einstein-Cartan gravity interacting with
classical spinor field is proposed. In this approach the spinor field becomes
an auxiliary field and the dynamical equation for this field (the Heisenberg
equation) is a dynamical, gravitational equation for torsion. The simplest
version of this theory is examined where the metric degrees of freedom are
frozen and only torsion plays a role. A spherically symmetric solution of this
theory is examined. This solution can be interpreted, in the spirit of
Wheeler's ideas of ``charge without charge'' and ``mass without mass'', as a
geometrical model for an uncharged and massless particle with spin (``spin
without spin'').
