 Betegh (2014: 162–6) has recently argued that while Philolaus’ system does make sense as a contribution to the tradition of rational Presocratic cosmology it at the same time incorporates and reinterprets elements of the religious tradition concerning the hearth. Thus, the hearth was the center of the household and putting a hearth at the center of the cosmos suggested that it was analogous to the household. The ritual by which the newborn child was carried around the hearth to introduce it into the household is now paralleled by the planets motion around the central fire. Moreover, Betegh argues that the Orphic tradition represented by the Derveni papyrus shows a similar tendency to give a new religious relevance to concepts derived from natural philosophy. He also argues that there are striking similarities between the cosmological theories of the author of the Derveni papyrus and Philolaus, partcularly in the role of fire. At the same time it is noteworthy that whereas the Derveni author presents a demiurgic mind as ordering the cosmos, Philolaus never explains what brought limiters and unlimiteds together to form the cosmos (on this lack of an efficient cause see also Graham 2014: 65–6). 