  We present novel asymptotically global AdS$_4$ solutions, constructed by
turning on a dipolar differential rotation at the conformal boundary. At fixed
energy and boundary profile, we find two different geometries: a horizonless
spacetime, and a deformed, hourglass shaped black hole with zero net angular
momentum. Both solutions exist up to some maximum amplitudes of the boundary
profile, and develop an ergoregion attached to the boundary before the maximum
amplitude is reached. We show that both spacetimes develop hair as soon as the
ergoregion develops. Furthermore, we discuss the full phase diagram, including
the possibility of phases with disconnected horizons, by considering the
Mathisson-Papapetrou equations for a spinning test particle. Finally, we
provide a first principle derivation of the superradiant bound purely from CFT
data, and outline possible scenarios for the late time evolution of the system.
