Many signs suggest that there is a worldwide rebirth of psychedelic research; a new era where scientific facts, therapeutic benefits, social maturity and a better understanding of the traditional and sacred uses of psychoactive plants have started dissipating prejudices about what have simplistically and erroneously been called ‘drugs’. Psychedelic research is indeed opening revolutionary venues in many fields, and it is in an equally revolutionary context that the first Paris Spring Symposium on Hallucinations in Philosophy and Cognitive Science took place last March. This is to be taken literally too, for the Symposium took place in the historical Couvent des Cordeliers