“The theoretical blind spot of current philosophy of mind is the issue of conscious suffering: thousands of pages are being written about color qualia or the contents of thought, but almost no theoretical work is devoted to ubiquitous phenomenal states like physical pain or simple everyday sadness (“subclinical depression”). [T]he ethical/normative issue is of greater relevance. If one dares to take a closer look at the actual phenomenology of biological systems on our planet, the many different kinds of conscious suffering are at least as dominant a feature as are color vision or conscious thought, both of which appeared only very recently. Evolution is not something to be glorified. One way – out of countless others – to look at biological evolution on our planet is as a process that has created an expanding ocean of suffering and confusion where there previously was none. As not only the simple number of individual conscious subjects, but also the dimensionality of their phenomenal state-spaces is continuously increasing, this ocean is also deepening. For me, this is also a strong argument against creating artificial consciousness: we shouldn’t add to this terrible mess before we have truly understood what actually is going on here.”

— Thomas Metzinger, A Self Worth Having: A Talk with Nicholas Humphrey (Edge.org)