Tappe stated that during the late 1960s and early 1970s she began noticing that many children were being born with indigo auras (or, in her terminology, with indigo as their "life color").[10][8][26] The idea was later popularized by the 1998 book The Indigo Children: The New Kids Have Arrived, written by husband and wife self-help lecturers Lee Carroll and Jan Tober.[27][28]In 2002, the first international conference on indigo children was held in Hawaii, drawing 600 attendees, and there have been subsequent conferences in Florida, Oregon, and elsewhere.[29] Several films have been produced on the subject, including two films by New Age writer James Twyman: a 2003 feature film Indigo and a 2006 documentary The Indigo Evolution.[29]