  A clear articulation of Method of Moments (MOM) Histograms is instructive and
has waited 121 years since 1895. Also of interest are enabling uniform bin
width (UBW) shape level sets. Mean-variance MOM uniform bin width frequency and
density histograms are not unique, however ranking them by histogram skewness
compared to data skewness helps. Although theoretical issues rarely take second
place to calculations, here calculations based on shape level sets are central
and challenge uncritically accepted practice. Complete understanding requires
familiarity with histogram shape level sets and arithmetic progressions in the
data.
