  We report new aspects of the recent theoretical progress in heavy quarkonium
physics. (1) Contrary to wide beliefs, the gross structure of the bottomonium
spectrum is described well by the non-relativistic boundstate theory based on
perturbative QCD. (2) This leads to a new physical picture of the bottomonium
states: the boundstate mass is composed mainly of the self-energies of b and
bbar accumulated inside the boundstate. (3) A connection to the conventional
phenomenological potential-model approaches is provided.
