  We have discovered a ~1 Hz quasi-periodic oscillation (QPO) in the
persistent-emission, the dips, and the type I X-ray bursts of the low-mass
X-ray binary 4U 1323-62. The rms amplitude of the QPO is approximately 9%, only
weakly depending on photon energy. The amplitude is consistent with being
constant throughout the persistent-emission, the dips and the bursts in all but
one observation, where it is much weaker during one dip. These properties
suggest that we have observed a new type of QPO, which is caused by
quasi-periodic obscuration of the central X-ray source by a structure in the
accretion disk. This can only occur when the binary inclination is high,
consistent with the fact that 4U 1323-62 is a dipping source. The
quasi-periodic obscuration could take place by partial covering of an extended
central X-ray source by a near-opaque medium, or by covering of a point source
by a medium of suitable characteristics to produce the relatively
energy-independent oscillations.
