 Sayre’s main work on neutral monism is his 1976. More recently David Chalmers has explored the idea of an informational ontology (see Chalmers 1996). And the related ideas that ultimate reality purely structural (Ladyman and Ross 2007; Floridi 2008, 2009), that it is a computational process (Fredkin 2003; Lloyd 2006), or a purely mathematical (Tegmark 2014) are the subject of a lively discussion.