There's an interesting thought experiment that I encountered towards the end of my degree, the swamp man. It runs along the lines of, if a swirling mass of molecules just happened to come together in the shape of a person (Anna), is Anna a person? If we forget the negligible possibility of this occuring, e.g. a fully developed, rational, Anna sprouting from the depths of a swamp, it raises some rather peculiar outcomes. Sidenote: we can add as much complexity to Anna as we like, for example it's very easy to insert thoughts, beliefs, undying love for Brad, etc. Not convinced? Well consider that it is much smaller step to move from having a developed person without beliefs to one with some, compared to moving from having a swirling mass of molecules to a fully developed person with no beliefs.
As I understand it, and I may not, the idea was to have thinkers say "Of course that's a person!". The problem with that is then that some complications arise. Some rather significant complications. For example, it may mean that personal identity has little to do with the way you were, and is all about the way you are now. This matters because thinkers have often identified our mental history as very significant to our personal identity. More than this, it may mean that personal identity doesn't exist in a significant sense at all. It also raises some other oddities. I mean, is a person without any beliefs really a person? Can someone actually know nothing?
One interesting consequence that I thought of in the shower this morning was the possibility that Catholics would be sinful if they were to disturb the creation potential swamp things. E.g. use of condoms is only required to have the potential prevent life in order to be sinful. Sometimes, it's sinful to use condoms for infection control even when there is an impossibility that life will be created. (One of the partners could be unknowingly infertile).
My real revelation was that the swamp thing must exist. At some stage in the development of the universe, molecular structures must have just swirled into place. Single celled organisms started! I mean, admittedly it seems inconceiveable to me that things must have just swirled into DNA - that's a pretty big molecule - but the fact that it exists now and that bacterial division cannot have gone on since the beginning of time, means that at some stage there was simply a few bits of stuff floating around. Hmm. Odd.
Tags: philosphy personal identity thought experiment swamp thing
Image: By Chan, http://flickr.com/photos/chal/81023774/.