The number of stellar systems within 10 parsecs (234 as of 1998.5) with various amounts of proper motion, or the rate of movement in arcseconds/year on the sky, is shown. The red bars outline the number of systems with unusually small or large proper motions. Systems with small proper motions (to the left in the figure) are those most likely to be missing from the present 10 parsec sample because they are not noticeably moving across the sky relative to other stars. Systems with motions larger than 2.5 arcseconds/year (to the right in the figure) are serendipitous discoveries of very fast moving systems. This limit is roughly the largest motion that could be noticed during the classical surveys for nearby stars, because systems that moved faster were often "lost" among other sources on the photographic plates used. There could be faint, very nearby, fast moving objects yet to be discovered.