Rarely do new words introduced to the public by a particular author become readily accepted as part of general discourse, and it is doubtful that Jung himself could have predicted how popular his invented term would become. His hypothesis of synchronicity was an attempt to discover the meaning in meaningful coincidences. Jung believed that perhaps something more was going on, namely that such experiences were in fact fleeting glimpses of an underlying timeless realm in which mind and matter are as yet undifferentiated. In this talk, we will focus on how Jung came to develop his ideas on this most fascinating topic.