  From the tangential velocities of stars all over the sky, one can, in a
statistical way, infer their 3D velocity distribution. An application to
Hipparcos data reveals rich structure in the planar stellar motions: there are
several moving groups, increasing in number with stellar type but decreasing in
importance. A distinct group of outward moving stars with low rotation
velocities might be associated with the Galactic bar: growing a bar in a smooth
model for the Galactic disk results in such a group, provided the Sun is
outside the outer Lindblad resonance (OLR) and the orientation angle with the
bar is in the first quadrant.
  The vertical motions show less structure, but the mean <v_z> increases for
large rotational velocities, which can be nicely explained by a warp of the
outer stellar disk.
