A philosophy developed by Plotinus in Alexandria in the 3rd century CE that consists of a modified version of Platonism combined with aspects of Judaic and Christian thought and possibly Oriental mysticism. Neo-Platonism holds that there is one source from which all existence comes from and with which an individual soul can be mystically united; it also emphasizes the plurality of levels of being, with the physical universe perceptible to the senses being the lowest.