  A central question in high-energy nuclear phenomenology is how the geometry
of the quark-gluon plasma (QGP) formed in relativistic nuclear collisions is
precisely shaped. In our understanding of such processes, two features are
especially crucial for the determination of the QGP geometry, respectively, the
nucleon size and the energy deposition scheme. This contribution reports on the
(circular) evolution of such features in state-of-the-art model incarnations of
heavy-ion collisions over the past seven years. Ideas for future directions of
investigation are pointed out.
