Uncritical commentaries often portray evolution as a ladder of progress, leading towards bigger, faster, and smarter organisms, the assumption being that evolution is somehow driving organisms to get more complex and ultimately more like humankind. Gould argued that evolution's drive was not towards complexity, but towards diversification. Because life is constrained to begin with a simple starting point (like bacteria), any diversity resulting from this start, by random walk, will have a skewed distribution and therefore be perceived to move in the direction of higher complexity. But life, Gould argued, can also easily adapt towards simplification, as is often the case with parasites.<ref name=FullHouse>Gould, S. J. (1996). Full House: The Spread of Excellence From Plato to Darwin. New York: Harmony Books.</ref> In a review of Full House, Richard Dawkins approved of Gould's general argument, but suggested that he saw evidence of a "tendency for lineages to improve cumulatively their adaptive fit to their particular way of life, by increasing the numbers of features which combine together in adaptive complexes. ... By this definition, adaptive evolution is not just incidentally progressive, it is deeply, dyed-in-the-wool, indispensably progressive." Cultural evolution Gould's arguments towards progress in evolutionary biology did not extend towards a notion of progress in general or notions of cultural evolution. In Full House, Gould compares two notions of progress against one another. While the first concept of progress, evolutionary progress, is argued to be invalid for a number of biological considerations, Gould permits that evolution may operate in human cultural evolution through a Lamarckian mechanism. Gould goes on to argue that the disappearance of the 0.400 batting average in baseball is paradoxically due to the inclusion of better players in the league, rather than players becoming worse over time. In his view such a process is likely reflective in a number of cultural phenomena including sports, the visual arts, and music where, unlike in biological systems, the realm of aesthetic possibilities is constrained by a "right wall" of human limits and aesthetic preferences. Gould later goes on to state that his arguments for biological evolution should not be applied to cultural change lest they be employed by, "so-called ‘political correctness’ as a doctrine that celebrates all indigenous practice, and therefore permits no distinctions, judgements, or analyses." Cladistics Gould never embraced cladistics as a method of investigating evolutionary lineages and process, possibly because he was concerned that such investigations would lead