Artist Brion Gysin developed the Dream Machine. The device has in its core a 100-watt light bulb, which is surrounded by a spinning open column with windows to allow the light to shine through. To be experienced with ones eyes closed, the Dream Machine has a flickering effect of light and dark, much like a strobe light. The experience has been described as hypnotic or hallucinogenic. Some have called the Dream Machine a drug-less high. Gysin, through archival interviews, many of the Dream Machine's users, some of whom are friends of Gysin, and scientists tell of their experiences with the machine and speculate on its physiological effects.