  The series of papers by Chandrasekhar and Munch in the 1950s were concerned
with the use of statistical models to infer the properties of interstellar
clouds based on the observed spatial brightness fluctuations of the Milky Way.
The present paper summarizes the subsequent influence of this work,
concentrating on the departure from their earlier discrete cloud model to a
continuous stochastic model in Paper V of the series. The contrast between the
two models anticipated and parallels current tensions in the interpretation of
interstellar structure, as well as intergalactic Lyman alpha clouds. The case
of interstellar structure is discussed in some detail. Implications concerning
the reification of models and the ability of scientific abstraction to model
complex phenomena are also briefly discussed.
