Why Is The Floor As Low As I Can Go?

I was recently explaining differing views on possible world semantics to Micah. I was fairly painstakingly tracing the nuances between popular and opposing views (Lewis, Kripke, Descriptivist, etc...) and he asked me something unexpected. These potentially useful theories are all well and good but he wanted to know why humans feel the need to project themselves (or in this case, anything at all)? This was not a question I was prepared to answer. Disarmed I scoured the web for something resembling an answer. It was Micah who found it and it would make an amazing Thesis topic!

The idea was that mirror neurons triger a similar function in the brain. This may be more of a cognitive science answer than a philosophy answer but its not as if the two are mutually exclusive, now is it? Wikipedia has an informative article on mirror neurons. Basically we would be talking about the potential significance to language: why do we project, in language, other worlds, which imitate or mirror that which we experience empirically? The easy answer is that this tool- possible world semantics- allows us to answer some questions about modal claims (possibility, contigency and necessity, for example). The remarkable thing about mirror neurons is the implication (and Grice surely is motivating me to continue with this problem) that there is another motivation, a neurological motivation, for postulating possible worlds.

As a side-note, this is, apparently, the best of all possible worlds or so is the return on a google image search for best possible world: