In "primitive" cultures, dual symbolic classification systems draw rigid temporal and spatial boundaries between the sacred and the profane. The right and left hands are described as sacred and profane, respectively. Durkheim saw a weakening of these systems as an aspect of modernization. A weakening of such dichotomous reason is shown in two examples. First, Hertz's study of the suppression of the left hand among the Maori links the left hand to the right cerebral hemisphere of the brain. The further (...) inference he might have drawn, but did not, is that the right hemisphere and its pattern thinking might play a significant role in magic, sorcery, and witchcraft. The Maori physical confinement of the left hand is no longer practiced. Second, in the United States, Hugdahl et al. present data from eight one‐decade cohorts showing that the decrease in left‐handedness by age was countered by a corresponding increase in left‐to‐right hand switching. A lower life‐span by left handers might account for some of the change across age cohorts, but at least half of the decrease in manifest left‐handedness was accounted for by a gradual decrease in social pressure not to use the left hand. Implications for the moral solidarity of postmodern society are discussed. (shrink)