 Causal essentialism. According to the theory of causal essentialism, the causal properties of physical properties are essential to them. Brian Garrett (2009) exploits this theory to argue that the zombie argument against physicalism depends on broadly Humean assumptions about the laws of nature and property identity which presuppose the falsity of causal essentialism. If we reject those assumptions and accept that some physical properties have essentially the capacity to produce consciousness, then ‘we cannot accept the genuine possibility of zombie worlds’ even if such worlds are conceivable (see also Aranyosi 2010).