In 1974, Georges Hansel proved that every non-ergodic, aperiodic, invertible probability measure $\mu$-preserving system has a uniformly ergodic topological model, meaning that for every continuous function the Cesaro averages converge uniformly. As a consequence, such a system is a disjoint union of uniquely ergodic systems. Moreover, Hansel proves that the model can be made a union of strictly ergodic (uniquely ergodic and minimal) systems. With Benjy Weiss, we are currently working on a new proof of Hansel's result, through which we also add one more property (which we call "purity") of the topological model: the strictly ergodic systems cocstituting the model represent only ergodic measures from an/a priori /selected set necessary for the ergodic decomposition of the initial measure $\mu$. In particular, a pure model has topological entropy equal to the entropy of $\mu$.