hob, absolutely facinating....altered states....wether triggered by meditative techniques (I have some limited knowledge),herbs etc (again I have some knowledge) or locations (as in sites etc, again iI have a limited experience) If you are in fact planning on researching such iI may have some interesting info etc, and i am certain paulus will help you out as we have been joint travellers on this path of research and experience for twenty years or more!!! All the best MM