  The azimuthal anisotropy of high-pt particle production in non-central heavy
ion collisions is among the most promising observables of partonic energy loss
in an azimuthally non-symmetric volume of quark-gluon plasma. We discuss the
implications of nuclear geometry for the models of partonic energy loss in the
context of recent RHIC data and consequences for observation of jet quenching
at the LHC.
