Ken Wilber, the highly prolific spiritual philosopher, narrates over a home video where he demonstrates his ability to enter four different meditative states - nirvikalpa closed eyes, nirvikalpa open eyes, sahaj, and mantra-savikalpa. Each meditative state is shown to have distinctive brain-wave patterns on an EEG machine. It's very cool and kind of freaky to watch someone's brainwaves change at will and cease altogether.