In 1967 I was living in San Francisco and I had been to a few of the late and great Bill Graham’s Rock shows at the Fillmore Auditorium. I was intrigued with the light programs he had, “light artist” put on displays as the bands played. I modified this projector so it would produce and ever changing 25 foot “kaleidoscope” image on stage and took it down to show Bill Graham one afternoon. That evening I was asked to set up for the band playing that night... it turned out to be Big Brother and The Holding Company with a girl singer named Janis Joplin. I talked to Janis after the show and she must of liked it because she kept saying “that was out’a sight man”
Note: in 2011, I donated the Kaleidoscope Projector to the Bill Graham Memorial Foundation.