 The tensions continued into the modern era and are still felt in our time. Perhaps as early as 1644, perfect being theology split into two camps over them (see Davies 2004: chapter 1, and Page 2019). Both camps take God to be absolutely perfect, but disagree over what it takes to be perfect: “classical theists” deny or weaken God’s personhood to save the Greek perfections such as impassibility, immutability and simplicity, while “theistic personalists” (a species of “neoclassical theists”) conversely deny or weaken the Greek perfections to save God’s personhood. “Open theists” (model 9 in this entry), for example, are theistic personalists: they call for new readings of, e.g., omnipotence and omniscience and drop immutability and impassibility to comport with God’s desire “to be in an ongoing, dynamic relationship with us” (Basinger 2013: 264–268, see also, e.g., Clark 1992; Pinnock et al. 1994; Sanders  1998).[38]  Other neoclassical theists aim merely to resolve inconsistencies among the perfections, as in Nagasawa’s Maximal God Theism (2008, 2017; model 10). In addition to its old challenges, perfect being theology also hit new ones in the modern era from advances in science. When it met Newtonian mechanics (and more) during the Enlightenment, the combination spawned “deism”, the idea that God set the initial conditions of the universe and then left it to play out on its own (model 11). Deism is a dualism because it assumes God can leave the world behind and thus is neither “in” it as in panentheism nor identical with it as in pantheism. Picture all these theistic dualisms as close to Dvaita Vedanta’s image of the eternal builder building a house out of something different from itself and dwelling in it as it pleases, but make the house not necessarily eternal (it may have had a start and may end), and for classical theism, give the builder all the perfections; for neoclassical theisms, give it a few less and perhaps have it throw better parties in the house; and for deism, have the builder abandon the house altogether once it is built and leave it to its own devices, like an “absentee landlord” (Mitchell 2008: 169).