  This contribution discusses the geometric tomography by highly energetic jets
penetrating the hot QCD matter in heavy ion collisions from RHIC to LHC
energies. In particular the geometric data on the azimuthal anisotropy of high
$p_t$ hadrons discriminate different models and strongly hint at energy loss
mechanism beyond those based on perturbation theory. Taking together the RHIC
and LHC data, the comparison with models is in favor of the model with strong
enhancement of jet quenching in near-$T_c$ matter.
