  Directional detection can provide unambiguous observation of Dark Matter
interactions even in presence of insidious backgrounds. The DM-TPC
collaboration is developing a detector with the goal of measuring the direction
and sense of nuclear recoils produced in Dark Matter interactions. The detector
consists of a Time Projection Chamber with optical readout filled with CF$_4$
gas at low pressure. A collision between a WIMP and a gas molecule results in a
nuclear recoil of 1-2 mm. The measurement of the energy loss along the recoil
allows us to determine the sense and the direction of the recoil. Results from
a prototype detector operated in a low-energy neutron beam clearly demonstrate
the suitability of this approach to measure directionality. A cubic meter
prototype, which is now being designed, will allow us to set competitive limits
on spin-dependent Dark Matter interactions using a directional detector.
